We have a vendor who has asked us to provide products for a customer, bill the customer directly, and add 10% to our prices as payment for the vendor for their services installing the products. My question is, how do we set this up to track it properly? I can add the vendor as a salesman, but do I link the vendor to the salesman number in Salesman Maintenance? If so, how do I track it in GL, and what effect does this have? I had done a test and linked the vendor with a Subcontracting Expense GL, but there wasn't anything listed in that GL account after updating. My theory is that there won't be anything there until we actually write a check to the vendor, but are not sure that we've got it set up correctly. We want to ensure that the 10% doesn't show up as our profit, but are at a loss as to how to track it properly.

We are using Sage 100 2016.