Modelling a specific list of options with an extra Int

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I’m looking to model colour sticker printing. In the trade, we use various designations e.g. 3C / 1C which means “print three colours on the front and one colour on the back”.

So far, I have created a DocType called “Print Colour Configuration” which has one field, “Name”, which goes from 0C / 0C to 4C / 4C.

But how do I say in the Item DocType, that I want x sheets of one colour configuration and y sheets of another colour configuration?

e.g. 1 sheet of 4C / 0C
3 sheets of 1C / 0C

I created another DocType called “Print Colour Configuration Quantity” but I’m not sure that’s what I’m looking for.