Del Partition/Extend Existing Partition

I have a server running Netware 4.11. There is a large partition on one of the drives that is no longer being used. I have a product from Power Quest called Server Magic 3.0 but I’ve never used it before myself. I what I need to do is delete the partition that is not being used and use the resulting free space to the remaining partitions. What is the safest way to accomplish this?