Gray Cloud

Hi All,
Recently we added sub domains in our company.
Main domain: company-dom
Sub domain1: CA-comapny-dom
Sub domain2: ND-comapny-dom
Etc.
This mode created two instances per user. The right one should be the sub
domain username. for example: CA-comapny-dom\username
How can i delete all the "old" instances of all users (company-dom\username) ?
Thanks a lot in advance