Containment is done on the "Transitions Pane", the panel on the right side of the Realm Works window.
Using the existing global categories, you'd likely create two Cast Lists: "Old Gods" and "New Gods". Then open each Deity and set its Containing Topic to the appropriate one.
To create your own Category (topic type, like Individual or Entity) you'd go to the Categories button on the Manage tab of the ribbon.
Hope this helps.
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