Change data type in Custom Field to drop down list

I'm glad you made it here, deb1171.

Looks like you're using the QuickBooks Online Advance(QBOA) since this is the only version that has the Custom Field feature. 

Let's try a few troubleshooting steps to isolate this issue about editing a previously created custom field to change the data type. There are times when a browser's cache becomes full or damaged. When this happens, issues like this can occur.

To start with, let's try logging in to your QBO account using an incognito or private browser. Since this doesn't store data in the cache, it the best place to isolate browser issues.

Kindly use either of the following shortcut keys:
 

• Google Chrome, press CTRL  + Shift + N
• Mozilla Firefox: press CTRL  + Shift + P
• Safari: press Command + Shift + N
  
  

Then, try editing the fields again. In case you need a handy reference in learning more about managing custom fields, check this out: Create and edit custom fields in QuickBooks Online Advanced.

If it works, you may want to clear the browsing history of your regular web browser. This will remove previously-stored browsing data that might have caused the issue. Otherwise, you can try using other supported browsers to be thorough.

We also have easy-to-access articles, webinars, and video tutorials that will help you in familiarizing the different tasks, features, and functions of QBO. Below are the following:

• All QuickBooks Tutorials.​
• QuickBooks Webinars.
• Help Articles.

Be sure to check back in with me here and let me know how this goes. I'm always around to help you in any way I can. Have a good one.