The reason why you would want to create Network Drive for local folders is for convenience. It is easier to browse to X: or Y: drive rather than going to “C:Documents and SettingsusernameMy DocumentsDestination”.
At first, I tried to use Windows XP built-in Explorer command Map Network Drive under Tools Menu. But this couldn’t map local folders.
But thanks to Techrepublic, there is old DOS command still available in Windows XP (I’m not sure it may be available in Vista or Windows 7).
All you have to do is Go to command prompt.
Start Menu –> Run –> Type “cmd”
Type “subst x: C:Documents and SettingsusernameMy DocumentsDestination”
You should change X: to any drive letter that you desire and “C:Documents and SettingsusernameMy DocumentsDestination” should be any of your target local folders.
After you’ve executed that above command, you can go to My Computers and you’ll see the brand new drive letter with your favorite folders content.
Source : TechRepublic