You can easily reassign them to the correct project by going to the Time Entries section in QuickBooks Online (QBO), pcdadmin.
Follow these steps:
Log in to QuickBooks Online.
From the left navigation panel, click on Time and select Time Entries.
Select the correct filters on the Date range or use Search team members
Find the time entry you need to move and click on Unapprove as Approved entries cannot be edited.
Locate the specific time entry you want to edit and click on it.
Under the Actions column, click Edit.
In the Customer/Project dropdown, select the appropriate project.
Click Save to confirm the changes.
If you are using QuickBooks Time integrated with QBO, remember to reflect these changes by going to QuickBooks Time and clicking Import. This will ensure that everything is synced and updated.
You can learn more about tracking time against a project through this link: Set up and use projects.