Is this variable available in the WebI

Hi There

I have a WebI report, now I need to get some of records(list) by some condition, for example

th raw data is

Tag SN Type

ABC 11111 Win2k

123 22222 Win2k

456 11111 Win7

789 44444 Win2003

now I need to get the data which "Type" is Win2k but the SN is not in the SN which "Type" is Win7, so I should only get one record which is

ABC 11111 Win2k

how can I get this data?