I have a customer requirement for mys users to have the ability to upload multiple products by way of an external text file to the quote line items. 
This would be part of the user experience each time they work on an opportunity and not an admin feature or use the data loader. I cannot think of a method of doing this. Any ideas ?
 

Hello!  I know that this seems like amateur hour everytime I post something, but I am struggling with something.  I need to always have the same product stamped onto my quote line items.  The need is because I have data coming from another system and there are far to many products to add into salesforce, so I am adding those names into a text field on the line items.  But, I need to have the lookup populated.  This needs to happen when the record is created.  Has anyone ever run into this use case?