It's OK to make a node group with name containing slash (eg. Group/16GB), and it's also OK to add some node into the group.
But, when I select the group leaf on HPC Cluster Manager, it doesn't refresh the list.
Furthermore, if I try to change the name containing '/' on the group tree view by pressing F2, Cluster Manager ends with following message,
"There was a network problem or the server was disconnected. Please try connecting again."
It seems that other characters like '&', '*', '<', '>' work fine.
I think that '/' has special meaning in the protocol between Cluster Manager and HPC Scheduler.