how to create unique attributes in an entity with a combination letters and Numbers and also some customizable naming patterns

hi would like to know  how to create sample ID    ID format should be  Some Request Types configuration has some ...  Type1 .. Type n AutoNumber for attribute should have the something like Type1ID000012 Type2ID000014 Type 1 and Type 2 should be formulated based on the type of the request type for this Request record.... Is this possible here..