I create a bundle for example called Time and Materials with no description and add 2 items to my bundle 1.labor and 2.materials I mark the bundle so customer doesn't see the items. Then when I create an invoice I add the bundle to my invoice and in the blank description feild I usually enter the work we did or maybe a brief list of the materials or xxhrs@$××. I then add my labor and billable expenses. After I do that I drag the billable items so they are added to the bundle. Pretty much to same as dragging the items to reorder them on a invoice. If you do this correctly you'll notice the line number will change. This adds the billable items to the bundle along with their totals. Save and print and you will only see the bundle. This way if you need to later check the invoice if a question arises you can click edit invoice and review the items and labor instead of removing the expense but keeping it linked. The original 2 items you can just leave them blank or you can remove them instead. I hope this helps.