Hi Jun,
Defining minimum per category can come in 2 ways:
- Define the total (combined) minimum quantities for products in a group (so, A, B, C are 3 products in category X, you can say the minimum quantity for 3 products combined is 6, like 3 of A, 2 of B, and 1 C)
- Define the individual minimum quantity for products in a group (similar to above, but here customers can’t buy less than 6 from A, B, or C)
Both options are configurable on category page, you have two fields:
Minimum quantity (grouped for this category), this works for case 1.
Minimum quantity for all product (apply to all products in this category), for case 2.
Please let us know if you still need more help.
Omar