aparnaa5347844,
Typically users gravitate towards one of the following set-ups:
Option1: An A/B Activity with one audience and then after distribute traffic to each experience. (90/10)
Option2: An XT Activity with two unique audiences for each Experience. (This would prevent you from doing the (90/10) but allow you to specify the additional return user vs new user for each Experience.
Now you bring up a good point and your requirements are more advanced. With the audience option at the Experience level in the A/B activity. This would be the closest you can get to what you need (See attached screen-shot below):
US Only > ExpA (Control) (90%) > Existing Users
US Only > ExpB (Variant) (10%) > New Visitors
If this satisfies your query please like, mark as helpful and mark as answer. Otherwise lets keep the conversation going. Hope you have a wonderful day.
Screen-shot 1 showing the experience audiences:
Screen-shot 2 showing the activity audience:
Mihnea Docea | Technical Support Consultant | Customer Experience | Adobe | (:: 1 (800) 497-0335