The "Copy to Bill" function should enable the Purchase Order to populate into the Bill automatically, Stefan. I'm here to ensure this gets resolved.

Since this isn't your case, let's take some troubleshooting steps to resolve this. If QuickBooks is behaving strangely, it could be related to problems with your browser.

We can open your QuickBooks account using an incognito or private window. This method is advantageous as it does not store any site information. You can use the shortcut keys provided below:

• Press Command + Shift + N (Safari)
• Press CTRL + Shift + N (Google Chrome)
• Press CTRL + Shift + P (Mozilla Firefox)
• Press CTRL + Shift + N (Microsoft Edge)

If it auto-populates to the Bill, you can clear your browser's cache to remove obsolete files. You can also access the system using a different supported browser as an alternative.

Refer to this guidance on entering bills and recording payments in QuickBooks. It provides comprehensive instructions to help maintain the accuracy of your financial records.

Moreover, you can discover the process of entering a previous balance for suppliers who owe you money in QuickBooks: Manage outstanding balances for customers and suppliers in QuickBooks Online.

If you require further assistance with managing bills or other concerns, please add your queries below. I'll be more than happy to provide additional help.