Questions How to receive money from manufacturer instead of customer on a project

Are there any of you out there using the Construction module to track projects and selling equipment for manufacturers that pay you a commission for selling their product? How would you receive that commission from the manufacturer when Acumatica only wants to receive money from the "project customer". 

We also need to track manufacturer's commission on each project for reporting. I mention that because the work arounds presented so far won't allow that. We rep many manufacturers and our relationship and how much we sell and get paid by them is a huge part of what we need to track.

Thank you for any ideas you may have. Our Acumatica partner has never worked with a manufacturer's rep before, so we are a bit of a unicorn for them.