It's a pleasure to have you here, @AZ13. I can share with you some insights about transferring the estimated taxes to an expense account.

To do this, we can create a journal entry. This helps you move money between accounts and force your books to balance in specific ways. That being said, I suggest consulting an accountant and follow their advice to ensure that your book is accurate. 

To create a journal entry, here's how:

1. Go to the + New button.
2. Choose Journal entry.
3. On the first line, select an account from the Account field. Depending on if you need to debit or credit the account, enter the amount in the correct column.
4. On the next line, choose the other account you're moving money to or from. Enter the same amount in the opposite column.
5. Check the amounts.
6. Enter information in the memo section.
7. Click Save and close.

For additional reference, feel free to view this article: Create a journal entry in QuickBooks Online.

In case you'll want to pay the taxes electronically in the future, you'll have the option to pay directly to eftps.gov or within QuickBooks. For detailed steps, see the Make payments online section through this article: Estimated Taxes.

Keep me posted if you need more help with estimated taxes in QuickBooks. I'll be around to help you. Have a nice day.