Category/Sub-Category Structure Best Practice

We are a school district and we have been using Samanage/Solar Winds for a few years now. Our end users really struggle when putting a ticket in if its an issue or a request. Part of the confusion is because they see the categories for Service Requests when in an Issue Ticket and vice versa. I was just wondering if anyone would share how they have their Category/Sub-Category structure setup? Below is an example of how our structure is setup but  not sure its the best structure. I wish you could have more than one sub-category. Any thoughts? Thanks

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