NSX-T - how to add a PortGroup as an Uplink for a Tier 0 Router

Hello,

The title may seem a bit confusing, but let me explain.

Currently, I have one port group "LAN" (on VLAN 0) in use as an uplink for a Tier 0 gateway, and on that same Port Group, we have the NSX-T Manager and NSX-T Edges.

I would like to have a Tier 0 Router that uses port group "sub28" as the uplink. The question is, where do I add that so a Tier 0 Router can use that port group as the uplink?

Kind regards,

Michael Goossens

PS: my apologies if it is a dumb question. I am still learning NSX-T and learning things as I go.