Replace or Subtract string

I have 2 columns being pulled in from mssql and need only a portion of
one column listed, for example I have:
Col1 Col2
--
--
BUILTIN_Administrators_master BUILTIN_Administrators_
sa_master sa_
DBA_msdb DBA_
...etc
I would like to, for lack of a better word, subtract column 2 from 1 to
leave "master", "msdb", etc.
Is this possible with SRS, and if so how?
Apparently I am new to this and not very skilled with the programming
aspect either, still learning. So any help would be appreciated.Got it using:
=Replace( Fields!path_leaf.Value, Fields!New.Value,"")sql