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Hello there, @lessenberry-anim.
Let me share some information on how the custom field works in QuickBooks.
When setting up a drop-down list custom field, you can add up to 100 options or items. Once you used-up all the available drop-downs, the Add item link will no longer be clickable.
You can read through this article for more detailed information: Create and edit custom fields in QuickBooks Online Advanced.
Also, I've added these articles to help you manage your custom fields:
Swing by here if you have other questions. I'm always here to help.
Just dropping by to make sure your concerns are addressed, @lessenberry-anim.
Did the information answer your query about creating a Custom Field drop-down list? If you need more clarification on this process, just let me know. I'll be sure to get back to you.
You're welcome to post again or leave a reply below if you have other concerns with QuickBooks.