I can see reasons for multiple costs (i.e. multiple vendors) but I have not used this feature that way as of yet. What I have done is this: Set up three different selling levels all using the same cost (for my purposes these are 'Retail', 'Preferred' and 'Open Tender'). Each price has a separate markup/margin. If I wish to change the overall markup for a job (product only, we don't adjust our labour costs), I open the product in Text Mode and show the "Price Type" column. I then select all product and change the Price Type to the one I want. This adjusts the product markup project-wide. The downside is that currently I don't see a way to automate the entries in MMPD, which means that I have to make sure to add the cost in all three lines when I add a product; if I don't it's a pain to go back and make the change after the fact.
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