Thanks for getting back to this thread, @BBF2.
In QuickBooks Self-Employed, categorizing purchases has limited choices. You'll have to choose which category it belongs to. For more insights, please review this article: About SA103F Categories.
I suggest consulting an accountant to give you better advice on the category you'll have to choose in the drop-down menu.
Moreover, let me attach these links to help you manage your QuickBooks Self-Employed account:
Fill me in if you have other questions about categorising purchases in QuickBooks. I'll be happy to help you. Stay safe!
