Link Parent and Child Group Snaphot

I've got a Parent SG which Contains 3 Child Groups

Parent_SG
   Child_SG1
   Child_SG2
   Child_SG3

Using the WUI I can create a snapshot of the Parent_SG, I can then link that snapshot to a new SG which will automatically create a new Parent Group and 3 new child groups and associated devices 

I've trying to replicate this using the CLI and symsnapvx but have not been successful

I can create the snapshot fine

symsnapvx -sid 001 -sg Parent_SG -name TEST_SNAP establish –secure -delta 1:00


when I then try to link the snapshot I run into errors


symsnapvx -sid 001 -sg Parent_SG -snap TEST_SNAP -gen 0 link -lnsg Parent_SG_NEW

this gives me the error 

"No Storage groups could be found for the specified input parameters"

I've then tried creating an empty destination parent group and trying the same command again 

symsg -sid 001 create Parent_SG_NEW
symsnapvx -sid 001 -sg Parent_SG -snap TEST_SNAP -gen 0 link -lnsg Parent_SG_NEW


"The number of source and target devices must be equal"