Use Multiple Instance of a Part in a BOM with different Expressions

I was able to create a configurable part with a BOM and associated parts with assigned expressions on when to use a part, however I ran into a different situation:
I'd like to use PART (P1) for all configurations, hence no assigned expression.
Also, I'd like to use the same PART (P2) for certain configurations (e.g., "OPTION" = A).
For that, I'm adding P1 PART to the BOM (without expression), then another item P2 PART to the BOM (with a warning that the part always exists); when I assign the expression to the 2nd instance of PART, it also gets assigned to the first instance P1.
I'd need a way to include multiple instances of a part in a BOM with separate, independent expressions.
Is there a way to add a clear separated instance of a part in a BOM?

Could you please advise?