How to create multiple catalogs under single functional area.

Summary:

currently, there is one catalog for purchasing with multiple categories in the hierarchy. now the customer is asking for a provision to assign the buyers to items (Assigning at the item level is tedious). so, can we create a new catalog and assign the buyer rule to a new one?

Content (required):

currently, there is one catalog for purchasing with multiple categories in the hierarchy. now the customer is asking for a provision to assign the buyers to items (Assigning at the item level is tedious). so, can we create a new catalog and assign the buyer rule to a new one?