in level "Customer Name" we have around 600 members. We want to filter for all except two customers.

I understand that we can increase this 250 to around 1000 without any performance impact, increasing beyond that will impact performance.

but my question is how to do this with an alternate way, I mean by just giving that 2 customers which we wants to exclude.

Can it be done through "exceptions".  Kindly suggest some ways.

Alos we have some levels where members are around 3000, then it can't be done through "Filters".