Separation of categories under BU's with Single Catalog

Summary:

Business requirement is separation of categories under BU's with Single Catalog.

In detail :

Scenario 1: For example XYZ is catalog for two business units and when load or create items all the categories are visible under same catalog.

BU-1 should not see the BU-2 categories and vice versa

Scenario 2: Create two catalogs one for each BU and assigning of functional area is not allowed for two different catalog

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