How can I change a bank account in the registry to a sub-account?

You can convert the bank account to a sub-account by editing it in the Chart of accounts, ram16.

Here’s how:

1. Go to the Gear icon, then Chart of accounts.
2. Locate the account you want to edit.
3. Click the dropdown beside View register, then select Edit.
   
4. Tick the Make this a subaccount box.
5. Choose the trust account as the parent account.
6. Hit Save.
   

For more details, visit this article: Create subaccounts in your chart of accounts.

If you have further concerns, don’t hesitate to drop a comment below.