Bank details can be added on your sales forms using the custom fields or footers in QuickBooks Online (QBO). You'll find the instructions for doing so below:
If you want to add the details as one of the custom fields:
Go to the Gear icon.
Choose Custom Form Styles.
Click Edit beside the Standard form style.
Select the Content tab.
Click the first section. Under Display, click +Custom field.
Hit Done.
If you want to add the details as footer:
Go to the Gear icon.
Choose Custom Form Styles.
Click Edit beside the Standard form style.
Select the Content tab.
Click the last section. From the Add footer text section, enter the bank details.