QuickBooks Desktop 2020
I typically enter bills and use Items to categorize the materials for a remodel job, then mark the item as billable on the bill so that when I generate an invoice I just add the materials from all the bills using the 'Add Time/Costs' feature.  This creates a 1:1 ratio and no markup on materials.  Some materials take a lot of time to source and customer interaction so I'd like to markup the material itself on the invoice, but if I do that then the P/L doesn't really show that markup as labor, which is what it technically is.  

When I enter the bill I can't alter/change prices or add a labor charge or it will throw off the bills.

If I change the item price inside the invoice then that just throws off the books.

Is there an easy way when using Items in QB Desktop to correlate markup on material to a labor category?