I think the issue is your list structures. Is each job only available in a single branch? My guess is not, which means that you have a many-to-many relationship. The function won't handle that for you, generally.
Take a look at the Country / Region / State example in the documentation; it ought to help.
https://spservices.codeplex.com/wikipage?title=$().SPServices.SPCascadeDropdowns
M.
Take a look at the Country / Region / State example in the documentation; it ought to help.
https://spservices.codeplex.com/wikipage?title=$().SPServices.SPCascadeDropdowns
M.