Referencing entity specific Multi-Select-Option-Set (Use existing Option Set)

Hi,

I'd like to create 2 new fields (Multi-Select-Option-Set) for an entity, the second shall reference the first one as its source (Use existing Option Set), because I want to make changes in only one option set. Both have the same options, but are used in different ways. I don't want to make the first field global, because it should only be used in the context of the entity.

Thanks for your help

Michael