How to attach multiple exspenses to one item on an invoice?

How to attach multiple exspenses to one item on an invoice?

How can I attach multiple exspences to a single item in an invoice. For example if I have a large number of exspenses (30 or 40 recipts) and I would like to show a total cost for these reciepts under one item such as (Materials) with out showing 40 lines of exspences on an invoice.????