Restricting Multiple value using Constraint

Dear Experts,

I person a concern with Multiple char values to beryllium restricted based connected cardinal quality maintained successful the variant table1.

Char1 - Single Value char

Char2 - Multiple worth char

If A is selected successful Char1 past Char2 should database 1,2,3 arsenic values successful a dropdown to choose. It tin beryllium achieved by specify constraint nett and constraint.

If A is selected successful Char1 past Char2 database 1 of 1,2,3，It cannot beryllium selected astatine the aforesaid time。Is determination a mode to execute it？

thanks，