Hello, PL35.
In QuickBooks Self-Employed, expense categories correspond to Schedule C tax forms. When you categorise a transaction, QuickBooks associates it with the corresponding line on your Schedule C. You can learn more about income and expense categories by checking this link: Categorise transactions in QuickBooks Self-Employed
At this time, creating custom categories in QuickBooks Self-Employed is not an option. We're looking into ways to implement dynamic categories while still serving their primary purpose as tax categories on tax forms. It's critical to do both in order to keep your estimated taxes accurate. We'll keep you updated on any developments regarding this feature.
But you can use TAGS as an alternative. This allows you to categorise each transaction, such as bespoke spending and earning. However, this functionality does not automatically categorise transactions that correspond to the Schedule C tax form.
Let me know if you have follow-up questions or concerns about banking and categories in QuickBooks Self-employed. I'll be here to help. Have a great day!