you are looking for “external storage” - this way NC “mounts” existing shares via NFS, SMB and local directories external to NCs native file system.
Be aware: I found external storage extremely slow down the system - at least with 3 bigger shares mounted via NFS.
Unfortunately still had no chance to test it with local storage.
Once you mount the external storage you should stop accessing it from outside of NC otherwise the NC may not reflect changes to the underlying file system (occ scan to fix)