Hi there, Angelic. It's great having you here in the QuickBooks Community.
I'd be glad to assist you in setting up a customer in your QuickBooks Online (QBO).
In your QBO account, go to Sales.
Select Customers.
Select New customer.
In the Customer display name field, enter what you want to display for the customer. (this is a required field)
Then, review each section and enter any other important customer info.
If the customer is tax exempt, go to the Additional info section and select the checkbox for This customer is tax exempt. Then, select why they’re tax exempt in the Reason for exemption ▼ dropdown.