I think you can add partitions and workspaces to any edition? Regardless, the only other way I could think to solve this would be to create folders for each rep and just ask for them only to look at their folders and limit their permissions based on their profiles. If they had their own folders with reports, campaigns, etc I'm sure they'd use it to their advantage. You could obviously filter each member based on the rep, but depending on how many reps you have this could be time consuming. But ideally I'd ask for partitions! It's not that pricey of an add-on.
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