It should be fairly easy to use it however you want. Basically there is a PlayerGroup table in the database where you can add groups and add Players to those groups. Each group has a group name that you pick and a group type. Here are the Group Types:
1 Party
2 Raid
3 Guild
4 Team
5 Faction
6 FlightGroup
7 Alliance
8 Squad
99 Other
Then after you add players to the group you can call my Launch Dungeon blueprint node where you send in a Player Controller and a Map Name. Here is the BP to add a player to a group:
Then when I click on the Launch Dungeon button in the video it runs this BP code:
I just loop through an array of Character Names and then call Launch Dungeon on each of the Player Controllers. The first call to Launch Dungeon spins up the map and then the others go into a wait mode until it is ready to connect. The Event Notify Launch Dungeon node is called when the map instance is ready to connect to, and then I just call Travel to Map to transfer the player to the newly spun up map instance.
Let me know if there is any other functionality you need from this system.