How can i redo a deposit that needs to be a split

I can help you update your bank deposit, @jvnbnn-70. 

You can go to your account's Chart of Accounts to edit this transaction. Then, add this interest amount in the Add funds to this deposit part. 

Here's how:

1. Go to the Accounting menu and then select the account associated with the bank deposit.
2. Click View register under the Action column.
3. Choose the transaction, and then tap the Edit button.
4. Add the interest in the Add funds to this deposit part
5. Make the necessary changes and click Save and Close once ready.

Refer to this article for more information about finding your transactions from the account register and editing them: Find, review, and edit transactions in account registers in QuickBooks Online. 

Once done, you can run a Deposit Detail report after making the needed changes. This report will show your deposits, with the date, customer or vendor, and amount. Just go to the Reports menu and then hover down to the Sales and customers section.

See this reference for more information about running and customizing this report: Customize reports in QuickBooks Online.

Should you need any further information with your bank deposit or anything else, feel free to ask. I'm only a post away if you need me. Wishing you and your business continued success!