Wholesale orders + Marketpress

Hi,
How would I do this...

If I am using Marketpress for wholesale, not retail, subsites have minimum order numbers depending upon the product.

Eg, domain.com/site1 sets a minimum order of 8 units for product A and 30 units for product C.
domain.com/site2's minimum wholesale order is 50 for all products... How would they set that up?

Right now I only see an option for numbers starting at 1.

Thanks