Just upgraded to 12.1 and was looking at creating a Perfstack project and found I can't get to what I want easily.
I've added two nodes to the Entities list but want to add certain interfaces from those entities but there's no interfaces listed.

I've also tried changing in add entities from node to Interface but when I do a search on the for PH10 which are the switches above all I then see are the other ends of the uplinks on our core and a backup link. Which suggests to me that the above display should also be displaying the interfaces.

How can I select a group of switches and have their up-link interfaces on a single or multiple graphs but on a single dashboard?
Any help would be much appreciated.
Thanks
Jon