Hi there, @JSMTokyo.
I understand that the ability to tag transactions would be helpful for your business. I'm here to provide you with some information on this matter.
The Tags feature's availability may depend on the region. It is currently unavailable in the QuickBooks Online (QBO) International versions. The system is continuously spreading out this capability to new businesses in the hopes that tags will soon be enabled for everyone.
In the meantime, you can use the class tracking feature to get more details on your sales, expenses, or profitability for each part of your business if you have the QBO Plus version.
To know more about the class tracking feature in QBO, you may visit this article: Class tracking in QuickBooks Online.
For your guide, check out these articles:
Add a comment below if you have any other questions. I'm here to keep helping. Have a good day!
