Product      Qunatity       Price

pen           2            10

pen           3            9

List<Quote_Item__c> qilist = new List<Quote_Item__c>();
   for(QuoteLineWrapper wrapper : req.qlines){
  Quote_Item__c qi = new Quote_Item__c();
     qi.Name = wrapper.qlineName;
   qi.Quantity__c = wrapper.quantity;
    qi.Unit_Price__c = wrapper.unitprice;
    qi.Orginal_Price__c = wrapper.orgPrice;
    qilist.add(qi);
   }

  //MAP QUOTEITEM TO QUOTE AND PRODUCT
   for(Integer rowIdx = 0; rowIdx < qlist.size(); rowIdx++)
    qilist[rowIdx].Quote__c =qlist[rowIdx].Id

   for(Integer rowIdx = 0; rowIdx < lstProduct.size(); rowIdx++)
    qilist[rowIdx].Product__c =lstProduct[rowIdx].Id;

      insert qilist;

MetadataService.MetadataPort service = new MetadataService.MetadataPort();
service.SessionHeader = new MetadataService.SessionHeader_element();
service.SessionHeader.sessionId = UserInfo.getSessionId();

MetadataService.CustomField customField = new MetadataService.CustomField();
customField.fullName = 'Test__c.TestField__c';
customField.label = 'Test Field';
customField.type_x = 'Text';
customField.length = 42;
MetadataService.AsyncResult[] results =
    service.create(new List<MetadataService.Metadata> { customField });

Quotable_Item__c item = [select ... from Quotable_Item__c WHERE ...];
List<Item_Quote> quotes = [SELECT Price__c, Quantity__c, Source__c, Id FROM Price_Quote__c WHERE Quoted_Item__c = :item.Id];