Maybe I'm overlooking the obvious but I have a product setup to charge $30 for an landlord annual membership and one to charge $65 for a vendor annual membership. If they choose the Landlord $30 membership I want them to be prompted to enter a unit count which adds $1 per unit. So their membership is $30 a year PLUS $1.00 for every unit they manage. If they are a vendor member as well they can add that for $65 or just sign up as a vendor but NOT be asked for unit count. Summary: Choose a specific product then be required to enter unit count? Thanks in advance for any help.