Thanks for checking with us, dougs55.
I'd be glad to help you with entering bills in QuickBooks Desktop for Mac. Let's get this working.
You may want to check if your QuickBooks release version is up to date.
Once you're done updating, try to enter a bill. If the button is not working, you can try to open a sample company file and enter a bill. If you're able to create a bill using the sample company file, then let's try to verify and rebuild your data.
To Verify Data:
To Rebuild Data:
If the problem persists, you can uninstall and reinstall the program to fix the issue.
Let me show you how:
These articles are a good reference:
Please get back to me if you continue to get the same results so I can look further into this. Have a good one.