Thanks for visiting the QuickBooks Community page, @CBqwerty. I can add some insights about recording vendor purchase rebates in QuickBooks Online.
You’re right, you can only have one location per transaction if you record it as a deposit. This means we’re unable to split and link this to the four (4) locations. We can only combine multiple transactions into a single record. Here's an article you can read on for more details about bank deposits: How to Record Bank Deposits?
As a workaround, you’ll want to create different transactions, so you can assign them to their designated locations. From there, you can use the find match feature to match them on your bank feed.
Furthermore, I highly recommend reaching out to your accountant to help you decide on the best route to take in recording the rebates you've received and choosing the accounts impacted. They'll be able to provide a more detailed information and guidance while handling this.
Feel free to read about using a gift card or vendor credits and refunds for your purchases moving forward:
Additionally, I've included an article that'll help match your QuickBooks account and bank statements: Reconcile an Account in QuickBooks Online.
I value you and the success of your business. Remember, I'm only a click away if you have any other questions. Enjoy the rest of your day!