How do I enter a check from a vendor into undeposited deposits?

Hello @otcservicesnj,

As of the moment, there isn't an integrated way to enter a vendor check to your undeposited deposits. But you can create a deposit showing your customer's payments together with the check from your vendor. Let me show you how.

1. Go to the +New button.
2. Under OTHER, select Bank deposit.
3. On the Select the payments included in this deposit section, select all the payments from your customers.
4. Below the RECEIVED FROM column, select your vendor.
5. Select any of your income accounts for the ACCOUNT column.
6. Enter the amount of the check you received from your vendor.
7. Click Save and close.

In the same manner, here's an article you can read to learn more about the nature of creating a bank deposit: Record and make bank deposits in QuickBooks Online.

On top of that, I've also included this reference for a compilation of articles you can use while working with us: Expenses and Vendors for QuickBooks Online.

If there's anything else that I can help you with, please let me know by leaving any comments below. I'll be here to lend a hand.