Os is Netware 6.5 sp4, NSS volume, client 4.91 on XP and or Win 2K

Is there any to split a drive letter mapping between two volumes ?
i.e. X:\smithr is on the volume server1\User;
X:\smithr\no-backup is the volume server1\Scratch:

The reason is that we the user to use the \no-backup directory for temporary
files that we will never backup.