You can use external exclusion tables for this. Create a separate table with your filtering criteria, then reference it in Find People/Companies using the "Exclude" section. [1]
You can also maintain a central exclusion table and link it to your primary table using "lookup single row action" for dynamic filtering without duplicating data.
This lets you filter against data that exists outside your import source.
If you still need help with filtering records based on external criteria, I’m here to assist. Would you like to provide more details about what you’re trying to achieve so we can continue?