Yes, it's just kinda tricky.
1. Create a Script Macro in the XPression Keyboard/GPI map:

2. In the script:
dim group as xpTakeItemGroup
Engine.Sequencer.GetGroupByName("TriggerGroup", group) 'name of the group here
group.Pause
You can also use:
.Cue
.SetOffline
.Execute
.Resume
3. Assign a RossTalk GPI # to the Macro in the "GPI column"
4. Trigger the Script Macro by using the RossTalk GPI # command.