Hi,
I have this VF page for Custom object (invoice__c). User when they post comment it display the date, comments and who posted it. it shows like this from column (A to C). We woul like capture another field "Assigned To" (column D)  on this page. So when user write comments they assigned it to some other users.



"Assgined To " is on the parent object (invoice__c) but i want to capture on child page too (invoice_detail__c)..here is my controller:
 

public with sharing class invoicedetails
{       
     Private final Id InvoiceId;
    
    public invoice_detail__c invoicedetail {get; set;}
   
      public invoice__c invoice {get; set;}
        
    public list<Invoice_detail__c> details
    {
        get
        {
            try
            {   
                string sRecordid=String.escapeSingleQuotes(InvoiceId);  
                
                list<Invoice_detail__c> tempdata = new list<Invoice_detail__c>();
				
                
                
                    tempdata = [select Date__c, Text__c ,createdbyid from Invoice_detail__c where Invoice__c=:InvoiceId order by Response_Date__c desc limit 50000];
                    
                    system.debug('\n----'+tempdata);    
		
                          
                return tempdata;
            }
            catch(exception ex)
            {
                return new list<Invoice_detail__c> ();
                
            }
        }
    }
       
   
    public invoicedetails(ApexPages.StandardController controller)     
    {       
        try
        {
            InvoiceId = controller.getId();
           
            invoicedetail = new Invoice_detail__c();   
            invoice = new Invoice__c(); 
         
        }
                
    }
        
        public Pagereference saveResponse()
    {
        try
        {   
            String sRecordid=String.escapeSingleQuotes(InvoiceId);  
            
                      
            if((sRecordid.length() == 15 || sRecordid.length() == 18) && Pattern.matches('^[a-zA-Z0-9]*$', sRecordid))
            {
                if(checkParticipants(sRecordid))
                {
                    invoicedetail.Invoice__c=InvoiceId;
            
                    //use for date and time(march release)
                     invoicedetail.Response_Date__c=Datetime.now();
                    system.debug('\n----invoicedetail--'+invoicedetail);
                    insert invoicedetail;
                   
                    invoice.id = InvoiceId;
                   
                   
                   
                    invoice = new Invoice__c();
                    
                    invoicedetail = new Invoice_detail__c();
                    PageReference CurrentPage = new PageReference('/'+InvoiceId);
                    CurrentPage.setRedirect(true);
                    return CurrentPage;                 
                }
                
            }
            return null;
        }
        
    }
   
 
}

Please help.