Long shot here but does anyone know if CSCART can provide a customer with a trade account to only purchase products in increments of 6 while keeping it ad 1 for non trade customers.
By default you can not achieve this on the same storefront.
So I see two possible solutions:
1) Use 2 different storefronts (for wholesales & retail customers) - in this case you can set separate setting values for each store. Moreover in this case you will be able to set different product descriptions/price rules etc.
2) Make a modification.