Thanks for getting back to us, @AmyPhil.
QuickBooks Online (QBO) has a character limit on each field for all forms. For the custom field on an invoice, it only has a maximum number of 30 characters.
You can check out this article for more information about these limits: QuickBooks Online file size and feature limits.
I can see how having the option to add more characters would be helpful for you and your business, and I'll take note of this. Our Product Engineers are always looking for ideas to consider how to improve QBO.
In the meantime, I recommend visiting our Blog site. This is where we share recent happenings and future developments, such as updates to newly added features. Here's the link: https://quickbooks.intuit.com/blog/.
Please leave a comment below if you have any other questions or concerns. I'm more than willing to help. Have an amazing rest of the day!
