Project Invoice Mark up against Project supplier invoice cost

 Hi,

Invoice amount is based on Profit margin + Supplier invoice amount, example If 10% is profit margin and supplier invoice cost amount is 1000 , so the project customer invoice amount is 1000+10% = 1100.

In projects every month billing happen based on the cost incurred for the month plus profit margin decided during contract singed.

Could someone help me to know how we can do this in projects module.

Thanks

Ravi