Thanks for coming back to us, @khurrum.

We can go to the chart of accounts to change the account type of multiple entries in QuickBooks Online (QBO). Please know that changing the type or tax form section of an account may affect your accounting and reporting.

Here's how:

1.  Go to the Accounting menu.
2. Select Chart of accounts.
3. Locate the account you want to change.
4. Click Edit under the Action column.
5. Select the Save account under drop-down arrow to choose a new account type.
6. In the Tax form section, select the appropriate detail type.
7. Hit Save. You are prompted that changing the Account Type may affect your accounting and reporting.
8. Select Yes to confirm.

Lastly, I've got you this helpful article for ideas about how you can review your transactions after categorizing them: Find, review, and edit transactions in account registers.

Keep me posted in the comments if you have any other questions. I'll be happy to lend a helping hand.