Billing details are also modified in a created invoice. This is a very simple process that can be done by following the below process
Business Portal > Sales > Sales Order New > Invoice Selection > Edit Invoice > Edit Billing Details
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Go to the invoice whose details are to be changed
Open the details of invoice
click on “Edit Invoice” button and click on “Edit Billing Details” that will open the inputs for the billing details
Change your billing details from here
You can also modify address details from here
Make required changes in the billing details and Click on “Save” button to update the billing details
Your Billing Details will be successfully updated