In Visual flow ,I have two screens ..In the first screen there are mutiselect checkboxes..In the second screen there are fields corresponds to those checkboxes..For example,there are five checkboxes in the first screen..and in the second screen there are five fields ..when i click two checkboxes i want that only two field will show..other fields will be hidden..how can i do this?

I have a vf page where i want to add rows every time "add  row" button is clicked..but i am facing some error..when a new row is created previous row's values are automatically copied ..
here is my controller class-
public class SayanTest{
public Service_Type__c acc{get;set;}
public Service_Request__c sr{get;set;}
public Service_Line_Item__c slt;
public List<Service_Line_Item__c> cont{get;set;}
//public List<Work_Order__c> wo{get;set;}
public List<Work_Order__c> wod=new List<Work_Order__c>();
public List<Service_Type__c > accl{get;set;}
//public List<Service_Line_Item__c> cont1{get;set;}
public Boolean showBank{get;set;}
public Boolean showCard{get;set;}
public Boolean showOther{get;set;}
public Boolean showTransfer{get;set;}
public boolean displayPopup {get; set;} 
public boolean flag1 {get;set;}
public String selected {get;set;}
public Boolean tenkservice{get;set;}
public Boolean engineoiltype{get;set;}
public Boolean clutchtype{get;set;}
public Boolean tyretype{get;set;}
public Boolean fanbelt{get;set;}
public Boolean coolant{get;set;}
public Boolean newRow{get;set;}
public Boolean estimation{get;set;}
public Decimal engrate{get;set;}
public Decimal clutchrate{get;set;}
public Decimal tyrerate{get;set;}
public Decimal fanrate{get;set;}
public Decimal coolrate{get;set;}
public Decimal englbr{get;set;}
public Decimal clutchlbr{get;set;}
public Decimal tyrelbr{get;set;}
public Decimal fanlbr{get;set;}
public Decimal coollbr{get;set;}
public Decimal allRateSpare{get;set;}
public Decimal allRateLabour{get;set;}
public Decimal sum{get;set;}
public Decimal count{get;set;}
public Decimal total{get;set;}
public Boolean tyrecount;
public Boolean engcount;
public Boolean clutchcount;
public Boolean fanbeltcount;
public Boolean coolantcount;
public Boolean oilfiltertype{get;set;}
public Decimal s;
public decimal engspare;
public Decimal englabour;
public Decimal engqty{get;set;}
public Decimal englbrqty{get;set;}
public Decimal clutchspare;
public Decimal clutchlabour;
public Decimal clutchspareqty{get;set;}
public Decimal clutchlbrqty{get;set;}
public Decimal tyrespare;
public Decimal tyrelabour;
public Decimal tyrespareqty{get;set;}
public Decimal tyrelbrqty{get;set;}
public Decimal fanbeltspare;
public Decimal fanbeltlabour;
public Decimal fanbeltspareqty{get;set;}
public Decimal fanbeltlbrqty{get;set;}
public Decimal coolantspare;
public Decimal coolantlabour;
public Decimal coolantspareqty{get;set;}
public Decimal coolantlbrqty{get;set;}
public Decimal allspare;
public Decimal alllabour;
public Decimal allspareqty{get;set;}
public Decimal alllbrqty{get;set;}
public Decimal oilfilterspareqty{get;set;}
public Decimal oilfiltersparerate{get;set;}
public Decimal oilfilterlabourqty{get;set;}
public Decimal oilfilterlabourrate{get;set;}
public Integer jobcount;
public Integer i=0;
public SayanTest(ApexPages.StandardController controller) { 
 acc= (Service_Type__c)controller.getRecord();
showBank = false;
      showCard = false;
      showTransfer = false;
      tenkservice=false;
      engineoiltype=false;
      clutchtype=false;
      tyretype=false;
      fanbelt=false;
      coolant=false;
      showOther=false;
      newRow=false;
      estimation=false;
      sum=0;
      s=0;
      count=0;
      total=0;
      engcount=false;
      clutchcount=false;
      engrate=0;
      clutchrate=0;
      tyrerate=0;
      fanrate=0;
      coolrate=0;
      allRateSpare=0;
      englbr=0;
      clutchlbr=0;
      tyrelbr=0;
      fanlbr=0;
      coollbr=0;
      allRateLabour=0;
      tyrecount=false;
      fanbeltcount=false;
      coolantcount=false;
      engspare=0;
      englabour=0;
      clutchspare=0;
      clutchlabour=0;
      tyrespare=0;
      tyrelabour=0;
      fanbeltspare=0;
      fanbeltlabour=0;
      engqty=0;
      englbrqty=0;
      clutchspareqty=0;
      clutchlbrqty=0;
      tyrespareqty=0;
      tyrelbrqty=0;
      fanbeltspareqty=0;
      fanbeltlbrqty=0;
      coolantspareqty=0;
      coolantlbrqty=0;
      allspare=0;
      allspareqty=0;
      alllabour=0;
      alllbrqty=0;
      jobcount=0;
           
    acc = new Service_Type__c ();
    cont = new List<Service_Line_Item__c>();
    accl=new List<Service_Type__c >();
   // wo=new List<Work_Order__c>();
   //wod=new Work_Order__c();
    //cont1= new List<Service_Line_Item__c>();
   // slt=new Service_Line_Item__c();
   
    AddRow();
   

}
public PageReference  AddRow(){
//Service_Type__c  s=new Service_Type__c ();
 Service_Line_Item__c sli=new Service_Line_Item__c();
    cont.add(sli);
   
    
    return null;
}


   
   

}

I have four objects...Service request..Service type..Service Line Item..Job Card..from Service Request related list i am creating service type which is a visualforce page..after saving the page i am able to create one service type and one service line item..But i also want to create multiple job card based on selected checkbox in the vf page..and the value will fetch from both service type and service line item..i am unable to do this..Please help..It's urgent..

I have a vf page where i want to add rows every time "add  row" button is clicked..but i am facing some error..when a new row is created previous row's values are automatically copied ..
here is my controller class-
public class SayanTest{
public Service_Type__c acc{get;set;}
public Service_Request__c sr{get;set;}
public Service_Line_Item__c slt;
public List<Service_Line_Item__c> cont{get;set;}
//public List<Work_Order__c> wo{get;set;}
public List<Work_Order__c> wod=new List<Work_Order__c>();
public List<Service_Type__c > accl{get;set;}
//public List<Service_Line_Item__c> cont1{get;set;}
public Boolean showBank{get;set;}
public Boolean showCard{get;set;}
public Boolean showOther{get;set;}
public Boolean showTransfer{get;set;}
public boolean displayPopup {get; set;} 
public boolean flag1 {get;set;}
public String selected {get;set;}
public Boolean tenkservice{get;set;}
public Boolean engineoiltype{get;set;}
public Boolean clutchtype{get;set;}
public Boolean tyretype{get;set;}
public Boolean fanbelt{get;set;}
public Boolean coolant{get;set;}
public Boolean newRow{get;set;}
public Boolean estimation{get;set;}
public Decimal engrate{get;set;}
public Decimal clutchrate{get;set;}
public Decimal tyrerate{get;set;}
public Decimal fanrate{get;set;}
public Decimal coolrate{get;set;}
public Decimal englbr{get;set;}
public Decimal clutchlbr{get;set;}
public Decimal tyrelbr{get;set;}
public Decimal fanlbr{get;set;}
public Decimal coollbr{get;set;}
public Decimal allRateSpare{get;set;}
public Decimal allRateLabour{get;set;}
public Decimal sum{get;set;}
public Decimal count{get;set;}
public Decimal total{get;set;}
public Boolean tyrecount;
public Boolean engcount;
public Boolean clutchcount;
public Boolean fanbeltcount;
public Boolean coolantcount;
public Boolean oilfiltertype{get;set;}
public Decimal s;
public decimal engspare;
public Decimal englabour;
public Decimal engqty{get;set;}
public Decimal englbrqty{get;set;}
public Decimal clutchspare;
public Decimal clutchlabour;
public Decimal clutchspareqty{get;set;}
public Decimal clutchlbrqty{get;set;}
public Decimal tyrespare;
public Decimal tyrelabour;
public Decimal tyrespareqty{get;set;}
public Decimal tyrelbrqty{get;set;}
public Decimal fanbeltspare;
public Decimal fanbeltlabour;
public Decimal fanbeltspareqty{get;set;}
public Decimal fanbeltlbrqty{get;set;}
public Decimal coolantspare;
public Decimal coolantlabour;
public Decimal coolantspareqty{get;set;}
public Decimal coolantlbrqty{get;set;}
public Decimal allspare;
public Decimal alllabour;
public Decimal allspareqty{get;set;}
public Decimal alllbrqty{get;set;}
public Decimal oilfilterspareqty{get;set;}
public Decimal oilfiltersparerate{get;set;}
public Decimal oilfilterlabourqty{get;set;}
public Decimal oilfilterlabourrate{get;set;}
public Integer jobcount;
public Integer i=0;
public SayanTest(ApexPages.StandardController controller) { 
 acc= (Service_Type__c)controller.getRecord();
showBank = false;
      showCard = false;
      showTransfer = false;
      tenkservice=false;
      engineoiltype=false;
      clutchtype=false;
      tyretype=false;
      fanbelt=false;
      coolant=false;
      showOther=false;
      newRow=false;
      estimation=false;
      sum=0;
      s=0;
      count=0;
      total=0;
      engcount=false;
      clutchcount=false;
      engrate=0;
      clutchrate=0;
      tyrerate=0;
      fanrate=0;
      coolrate=0;
      allRateSpare=0;
      englbr=0;
      clutchlbr=0;
      tyrelbr=0;
      fanlbr=0;
      coollbr=0;
      allRateLabour=0;
      tyrecount=false;
      fanbeltcount=false;
      coolantcount=false;
      engspare=0;
      englabour=0;
      clutchspare=0;
      clutchlabour=0;
      tyrespare=0;
      tyrelabour=0;
      fanbeltspare=0;
      fanbeltlabour=0;
      engqty=0;
      englbrqty=0;
      clutchspareqty=0;
      clutchlbrqty=0;
      tyrespareqty=0;
      tyrelbrqty=0;
      fanbeltspareqty=0;
      fanbeltlbrqty=0;
      coolantspareqty=0;
      coolantlbrqty=0;
      allspare=0;
      allspareqty=0;
      alllabour=0;
      alllbrqty=0;
      jobcount=0;
           
    acc = new Service_Type__c ();
    cont = new List<Service_Line_Item__c>();
    accl=new List<Service_Type__c >();
   // wo=new List<Work_Order__c>();
   //wod=new Work_Order__c();
    //cont1= new List<Service_Line_Item__c>();
   // slt=new Service_Line_Item__c();
   
    AddRow();
   

}
public PageReference  AddRow(){
//Service_Type__c  s=new Service_Type__c ();
 Service_Line_Item__c sli=new Service_Line_Item__c();
    cont.add(sli);
   
    
    return null;
}


   
   

}

I have four objects...Service request..Service type..Service Line Item..Job Card..from Service Request related list i am creating service type which is a visualforce page..after saving the page i am able to create one service type and one service line item..But i also want to create multiple job card based on selected checkbox in the vf page..and the value will fetch from both service type and service line item..i am unable to do this..Please help..It's urgent..