Is there a way for us to manually assign a test variation? Say I wanted to do a geo holdout test, could I use my own logic to decide if they are in test variation 1 or 2? (i.e. if they are in one of 10 states) and then view the results in growth book?

Hi Ryan, I am not affiliated with GrowthBook, and I don't know if we can answer each other questions here, but here is what you can do. you can implement your own splitting logic and add a query in GB to for experiment assignment and then instead of creating an experiment from a feature on GB, you go to experiment -> Add Experiment -> import existing experiment, then you can see the results on GB. Keep in mind that splitting by states is not a proper AB testing.