Divide a product into groups so that a desingn can be alocated to a group and the customer can then chse the colour.
Separate product into groups to make allocating designs easier.
If you have white writing e.g. copyright etc. then you cannot allocate that to a white or pale light colour, because it will not show up. so you have an alternative design in black which will not show up on Back, navy or dark Gray items. As a result I have to make a product of each colour allocating the appropriate colour design.
If you grouped the products into groups for black/blue design printing and white yellow printing we would need to have two products where the customer would choose the colour for that product group. That would often result in the two products instead of one for each colour sometimes 8 or more plus.