HI Kristen, Thank you for posting this question.
The Advocate quests (as many as you create) will be aimed to the one Advocate group you created.
The the next release of Rewards, We are planing to add the ability to filter the audience of the quest by group.
Will that answer the use case you are talking about ?
Yes, if I could restrict quests to just one group, that would meet my need.
When's the next release? We're migrating our entire advocates program into Jive and I'm hoping it'll be by then (end of Feb)!