How do i change which account a payroll check drew from on transactions that have already occurred. I am showing them in two places

Thanks for dropping by the Community, @nicv.

I'm here to lend a hand in modifying your account for a payroll check.

With regards to this, we can go to the Payroll Settings page and change the setup of your accounting preferences for your payroll from there. I'll show you how:

1. Click the Gear icon and choose the Payroll setting.
2. Go to the Accounting section. Then, click the pencil icon to expand the page.
3. Set up the appropriate account for each payroll preference.
4. Then, select Continue once done.

Moreover, I've got this handy article that has details on how to determine what account type you can use for your payroll transactions and procedures in case you want to change your past transactions after updating your account: Change your accounting preferences in QuickBooks Online Payroll.

In case you want to create your paychecks outside of QuickBooks, this guide can help you with the process: Manually enter payroll paychecks in QuickBooks Online.

Let me know how else I can help you with payroll-related tasks by commenting below. I'll get back here as soon as I can to help you again.