this is the trigger i have written and i am getting error for 100 records as dml statements error how to rectify the error plz help me how i can rectify the error

trigger WOW_Fulfill_UpdateITQty on Fulfillement__c (before insert,after update) {


for(Fulfillement__c IFM :Trigger.new){
item__c i8=[select id,type__c from item__c where id=:ifm.item__c];

//trigger executes when the type value equals fifo
if(i8.type__c=='fifo')


{
//retrieving the IT where  warehouse and item eqauls to that of fulfilements
Inventory_Transaction__c[] IT = [select   id,
                                        Item__c,
                                        Qty_In__c,
                                       Dev_Bucket_Qty_Remaining__c,
                                        Qty_Out__c,
                                        warehouse__c
                                             from Inventory_Transaction__c 
                                             where Item__c =:IFM.Item__c AND 
                                             Warehouse__c =:IFM.warehouse__c 
                                             
                                             Order By Date__c asc];
      //AND Dev_Bucket_Qty_Remaining__c != 0
      //if there are no records then error 
        if(it.size()==0)
    {
    
    IFM.addError('Record is not available');
    }
    else
    {
  //taking sum of al the bucket qty in IT                                           
Integer count =[select Count() from Inventory_Transaction__c where Item__c =:IFM.Item__c AND 
                                             Warehouse__c =:IFM.warehouse__c ];

Decimal TOTALQTY = IFM.Qty_Out__c;
Integer i=0;
List<AggregateResult> tq=[select SUM(Dev_Bucket_Qty_Remaining__c)som1 from Inventory_Transaction__c where Item__c =:IFM.Item__c AND 
                                             Warehouse__c =:IFM.warehouse__c ];
Double doubledata =(Double)tq[0].get('som1');
integer trq =integer.valueof(doubledata);
system.debug( 'Integer value ' + trq);

if(TOTALQTY>0)
{

 if(trq>=TOTALQTY)
  {
   if(TOTALQTY>=IT[i].Dev_Bucket_Qty_Remaining__c)
   {
    Decimal j=0;
    j=TOTALQTY-IT[i].Dev_Bucket_Qty_Remaining__c;
    if(IT[i].Qty_Out__c!=null)
    {
     IT[i].Qty_Out__c=IT[i].Qty_Out__c+IT[i].Dev_Bucket_Qty_Remaining__c;
    }
    else
    {
     IT[i].Qty_Out__c=IT[i].Dev_Bucket_Qty_Remaining__c;
    }
    TOTALQTY=j;
    IT[i].Dev_Bucket_Qty_Remaining__c=0;
    upsert IT[i];
    
    //Creating fulfilement history for the updatedIT
    Fulfillement_History__c ih=new Fulfillement_History__c();
    ih.Inventory_Transaction__c=it[i].id;
  
    ih.Fulfillement__c=ifm.id;
    ih.Qty_Out__c=it[i].Qty_Out__c;
    insert ih;
    //incrementing i
    for(i=1;i<count;i++)
    {
     if(TOTALQTY>0)
     {
      if(TOTALQTY>=IT[i].Dev_Bucket_Qty_Remaining__c)
      {
       Decimal k=0;
       k=TOTALQTY-IT[i].Dev_Bucket_Qty_Remaining__c;
       if(IT[i].Qty_Out__c!=null)
        {
         IT[i].Qty_Out__c=IT[i].Qty_Out__c+IT[i].Dev_Bucket_Qty_Remaining__c;
        }
    else
       {
        IT[i].Qty_Out__c=IT[i].Dev_Bucket_Qty_Remaining__c;
       }
       
      TOTALQTY=k;
      
      IT[i].Dev_Bucket_Qty_Remaining__c=0;
      upsert IT[i];
      Fulfillement_History__c ih1=new Fulfillement_History__c();
    ih1.Inventory_Transaction__c=it[i].id;
   
    ih1.Fulfillement__c=ifm.id;
    ih1.Qty_Out__c=it[i].Qty_Out__c;
    insert ih1;
     }
    else
    {
      Decimal l=0;
      l=IT[i].Dev_Bucket_Qty_Remaining__c-TOTALQTY;
      if(IT[i].Qty_Out__c!=null)
        {
         IT[i].Qty_Out__c=IT[i].Qty_Out__c+TOTALQTY;
        }
    else
       {
        IT[i].Qty_Out__c=TOTALQTY;
       }
     IT[i].Dev_Bucket_Qty_Remaining__c=l;
     TOTALQTY=0;
     upsert IT[i];
     Fulfillement_History__c ih2=new Fulfillement_History__c();
    ih2.Inventory_Transaction__c=it[i].id;
    
    ih2.Fulfillement__c=ifm.id;
    ih2.Qty_Out__c=it[i].Qty_Out__c;
    insert ih2;
    }
   }
  }
 }
  else if(IT[i].Dev_Bucket_Qty_Remaining__c>=TOTALQTY)
  {
   Decimal m=0;
   m=IT[i].Dev_Bucket_Qty_Remaining__c-TOTALQTY;
   if(IT[i].Qty_Out__c!=null)
        {
         IT[i].Qty_Out__c=IT[i].Qty_Out__c+TOTALQTY;
        }
    else
       {
        IT[i].Qty_Out__c=TOTALQTY;
       }
     IT[i].Dev_Bucket_Qty_Remaining__c=m;
     TOTALQTY=0;
     upsert IT[i];
     Fulfillement_History__c ih3=new Fulfillement_History__c();
    ih3.Inventory_Transaction__c=it[i].id;
    
    ih3.Fulfillement__c=ifm.id;
    ih3.Qty_Out__c=it[i].Qty_Out__c;
    insert ih3;
     
    }
   }
   //error message when the quantity is more than given
   else
   {
    IFM.Invoice_Line_Item__c.addError('Quantity is more than the required Remaining Quantity for Invoice line Item ');
   }
  }
   else
   {
    IFM.addError('Quantity is more than the required Remaining Quantity');
   }
  }
  }
  
  
  //trigger executes when the type value equals serial number
  
  
 
  
}
}