Since categories have to be unique we typically recommend that folks have group per property and then use a prefix per category so you can report on individual properties.
So Group is 123 Magnolia St then the categories are 123M-Rent, 123M-Maintenance, etc where 123M is a unique identifier for 123 Magnolia St categories.
There is a rental property tracker concept our founder shared here under Show & Tell.
The Category Rollup report in Labs offers an option to do reporting by type/group/category and the Monthly Analysis sheet in Labs also allows you to choose groups.
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