Hi again, @aaronsonrepairsl.
I appreciate you taking the time on getting back to me and for trying the steps I've provided to get this working.
I tried on my test account, and I was able to add an amount on the invoice. I also check if there's an ongoing issue about this, but there isn't currently one.
Since you're still having the same issue, I highly suggest reaching out to our Support Team so they can check this using their screen-sharing (remote access) tool. They can also perform other troubleshooting steps to fix this for you. Here's how to reach them:
1. On your QBO account, click Help (question mark icon) at the upper right.
2. Select Contact Us at the bottom to connect with our Support Team.
After contacting them, I'm confident can you can finish creating your invoice in no time.
Please let me know how it goes in the comment section. I'm just a few clicks away if you should need anything. Take care always!