Ability to have unique set of categories for an idea portal Merged

If workspace has multiple ideas portals, ability to have unique categories for each ideas portal. For one idea portal, perhaps I want to have those ideas with a category of dealer experience. I do not want the customer to have other options for categories. For another ideas portal, perhaps I want a selection to be dealer experience plus others. I want the customer to have multiple options. There isn't a way to hide categories from one portal or to automate the population of the category for a specific ideas portal.