Custom Products V2 - unique order numbers per combination

Hi there,

i’m implementing Custom Products V2 for the first time.
As a test case i’m using products with 2 options: Color Front + Color Back
The combination of the 2 options should result in 1 single orderNumber.
I can add an ordernumber for each option but how can i get the combination of both as 1 ordernumber as seen in the table below?