I would like to sell a set of products as follows:
A set of 20 lipsticks where 10 color options are available:
The customer can purchase any combination of colors with any qty, but a total qty of 20.
For example
5 Red, 4 Yellow, 7 pink, 4 green
10 Red, 3 Yellow, 3 pink, 4 green
3 Red, 2 Yellow, 9 pink, 6 purple
15 Red, 5 Blue
2 Red, 2 Blue, 2 Yellow, 2 pink, 2 purple, 6 brown, 4 gold
How can I achieve this?