revenues or cash flow work around

 i'm trying to track revenues earned based on work performed versus costs estimated. and i don't see how to do that in p6. does any one have a work around that is able to spread costs over an activity duration that isn't the resource or budgeted costs?  (i'm using those for my estimated costs)

example -

100lf of sidewalk @ $20/lf = $2000 in revenue

100lf of sidewalk will cost $10/lf of material, labor etc over 20 days.

how do i get a report to list

revenues=$500/wk  (5-day work weeks)

Cost = $250/wk