Thanks @DougHiggs, and @DianeRuth, I have a call in to ACS.
Where the client has the Vendor inventory as well as customer, the Vendor inventory is a liability, right? So would you think using a contra-account for that inventory/warehouse would work? I am not super familiar with Multi-Bin, but I assume the GL account would be associated with the Warehouse and not the Bin...same as standard Sage. Does that change anything as it moves from being a liability to a sale? It still debits and credits the correct accounts when sold from what I can gather (reduces the liability), and the invoice from the vendor would hit the correct expense accounts. - I REALLY need to review my accounting books! Does that sound right?