Hi muyezhang,

Thanks for posting in the Community! If you're trying to pay your bills, you can enable batch payments and create ABA file. First thing you'll need to do is to enable batch payments for your bank and for your supplier. 

To enable batch payments for your bank:

1. Go to the Gear icon and select Chart of Accounts.
2. Find your bank account.
3. In the Action column drop-down, select Edit.
4. Check the box I create batch payments for this account.
5. Fill in the relevant information for your bank, and then Save and Close.

To enable batch payment for a supplier:

1. Go Suppliers.
2. Select the supplier that you want to create the batch payments for.
3. Select Edit.
4. Check the box I create batch payments to pay this supplier.
5. Fill in the supplier’s banking details, then Save.

Once done, you'll be able to create a batch payment file which you can use to batch pay your suppliers from your internet banking.

1. Select + New.
2. Select Pay Bills.
3. In the Payment account field, select the account you want to make a batch payment for.
4. Check the box of the bill/s you want to pay.
5. Select the Save ▼ dropdown, then Create batch payment.

You can also set up and pay your employees via ABA file. You can check on this article for reference: Set up and create ABA files in QuickBooks Payroll. 

To help you get started with QuickBooks Online, you can check on this link and select Learn and Support if you would like to access the recorded webinars or download the user guides. 

Feel free to drop a comment below if you need any help. Have a great day!