Is there any documentation or link you may have for nested file systems?

just copy that folder to a new file system and re-create the share.

take a look at nested file systems, it might help you accomplish what you are trying to do.

Sorry, I guess I should have mentioned that I need to keep the original share as there are other folders in there

I cannot just re-create the share as when I do this, it tells me the share name already exists, which is true because I need to keep the original share

Managing Celerra Volumes and File Systems Manually  6.0 A01

How about the manual?

Go to Powerlink and download the complete VNX file documention set

Is there a way to do this via the GUI and not via command line?

Also can I set this up with two existing file systems with data on them, or just with new file systems?

i have not set it up with file systems that had data, i am sure you can test it with a couple of test file systems.

I went through the manual, and was not too clear at all

Instead of using CLI, can I do it straight from Unisphere?

Yes – everything that can be done in UniSphere can be done via the CLI - see the manual

I recommend to go to Powerlink and download the complete VNX file documentation set