I am creating a bill but when I use the drop down menu to select the account I need the system does not show me all the accounts so I can not select the account I need

Mine did that, too.  Right in the middle of using it.  

I logged out of QB, cleared cache and logged back in. Still didn't fix it.  

I had to use the search bar to find the vendor I needed.  In the process of doing that for the second vendor, it fixed itself.  

Not sure if any of that is helpful to you, but that's what happened here.  

Thanks for the input. Hasn't fixed itself yet but I am using the search bar to track down the right account. Not perfect but at least I can use it!

Thanks for dropping by the Community forum, @jimarta. Let me be the first to welcome you. It's a pleasure that you've chosen the Community to express your concern, and I'd be delighted to assist you.

Creating accurate bills is critical in running a business. I recognized how strange behavior of QuickBooks Online hinders you from accomplishing tasks promptly.

On my test account, I performed the steps of creating a bill and was able to see and select vendors using the dropdown button.

You can use Just_Me's workaround of using the search bar to find your vendor. However, I recommend that you also perform some basic troubleshooting steps. The system sometimes operates strangely when the browser is full of outdated pages.

Let's begin by signing in to your account in a private window. Here are the keyboard shortcuts:
 

• Safari: Command + Shift + N
• Google Chrome: CTRL + Shift + N
• Mozilla Firefox or Microsoft Edge: CTRL + Shift + P

In there, try to create a bill again. If it's successful, return to your default browser and clear the cache and cookies to start afresh. If not, you can use another supported browser to optimize your QBO experience.

Financial reports provide an overview of your business. If you want to keep track of your bills or any transactions, you can run different reports to know various aspects of your business performance. 

The Community is available at any time of the day. Feel free to reach out to us if you need further assistance with your bills in QuickBooks Online. I'm rootiing for the success of your business, jimarta. Take care!