REM delete all mapped network drives
net use * /DELETE /Y
REM map two drives
net use W: "\\\SharedFolderA" /persistent:yes /user:usernameA PaSsWorDA
net use T: "\\\SharedFolderB" /persistent:yes /user:usernameB PaSsWorDB

what you need to know: windows CAN NOT establish two connects to the same server with different usernames.

it just can’t.

so what you need to do is make all shared folders in question accessible to the one user that connects.

and then you can do:

net use W: "\\\SharedFolderC" /persistent:yes /user:usernameA PaSsWorDA