The answer is yes, sort of.. You can build a UDF that references another table in the same database, and use that UDF in the formula, I believe you can persist it.

If you can persist it DO! You don't want it hitting that UDF for every access to that column..

That UDF becomes bound to the table and cannot be changed without a mod to the table first to remove the reference.

so get it right the first time..

CEWII