Can I use multiple subcategories of "other expeneses" to track tax deductible expenses that are NOT related to my primary business? I don't want it to show on GST reports

Hello finance32!

We're unable to do this. Any entries that will affect your tax deductible expenses will show on your GST reports. I'd suggest reaching out to your accountant about this case.

If you have other questions, please let me know.

In addition to what @JessT said

in a company accounting file there should only be transactions that pertain to the company, nothing else.

If you are a sole trader and these "other transactions" are personal then the money you spend should be entered as an owner draw, then what you do with it is up to you