I agree Dzintars on login scripts.
You SHOULD not be storing any kind of data on the SYS volume, if this is why you need to expand the SYS volume size you should instead move data to another volume such as "VOL1" or "DATA" whatever other volume you have. Printing volume should also NOT be SYS.
It is extremely poor design (although legacy systems were treated that way) to have anything on SYS: volume other than what the NW OS puts there!!
You can spread your SYS volume across multiple physical drives (called SPANNING the volume). This can lead to major issues later in life, so I DO NOT RECOMMEND this approach. In a former life, I inherited a NW4.11 server with spanned volumes - when it came time to upgrade it, it created multiple long weekends because a spanned volume will contain multiple DET (Directory Entry Tables - kind of like FAT on DOS/Windows).
Now that I've scared you - if you really need to do this, load up INSTALL.NLM. Under the disk options, you need to create the NetWare partition on the new drive. Then, you will have the option to expand the SYS volume on the new partition. Check out TID 10019754 on support.novell.com for more information on SPANNING a volume.
Your best solution is to buy a much bigger hard drive and do a backup and restore than to span the SYS volume!!