You would need to setup Section Access. There is a specific format you need to use to insert this logic into your apps.
You load your section access data either through an inline table or from a file.
The format is
ACCESS USERID fieldname
ACCESS can be either USER or ADMIN
USERID is the domain\AD userlogin
fieldname is the field that you want to limit access by(for example Branch #)
So each row in your data would look something like this:
USER domain\userid 50
This would allow this user to see data for branch 50
This turned out to be easier than I thought. In Qlik Sense terms this is referred as "Dynamic Data Reduction". You can setup horizontal (REDUCTION) or vertical (OMIT) security by using session access in your data load script.