Create PLAN with only one Inventory Category

Summary:

Need to segment the plan to only see and require one specific inventory category.

Content (required):

We are trying to create a plan that auto releases recomendations, but cannot manage to "segment" it to only look for one inventory category in it's dimensions.

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):