I get your point about how important it is to to add a Unit of Measure (UOM) to your invoices in QuickBooks Online (QBO) for a specific data and set it up according to your preferences. However, this feature is currently unavailable.
We understand the importance of having these features available in QuickBooks Online (QBO) for your business preference. Please know that our Product Engineers are continually developing features to assist our customers.
I'd recommend sending feedback so they can consider this in future software updates. We appreciate your suggestion. You can follow these steps on how to send feedback:
Log in with your QuickBooks Online (QBO) account.
Go to the Gear⚙️ icon, select Feedback under PROFILE.
Enter your comments and product suggestions and click Next to submit.
Moreover, if you are looking for a specific third-party app to integrate with QBO for this purpose, please know that we’re unable to suggest a specific one. However, you can compare their features, and ratings, and read other users' comments on this page: QuickBooks App Store.
Feel free to comment below if you have any further questions relating to mange invoices in QuickBooks Online. I'm always here to help. Have a great day!
I can recommend one inventory management app with UoM feature and it starts from $39 per month for 2 users. It allows to create any name of the desired unit of measure to meet your requirements. Contact me in private for details.