Reinstall SCOM 2012, create a different management group, but use the original "OperationsManager" DB...how can I accomplish this?

New to SCOM

I'm attempting to recreate a SCOM 2012 Test environment, but using a different Management Group name.

When I attempt reinstall SCOM and use the same "OperationsManager" database from before, I get the error "specific name of DB in use please provide a different DB name".

is it possible to use the old OperationsManager DB for a newly created Managment Group?

Thank you.