I understand that you would like to know if it is possible to send the invoices from WooCommerce to a custom email.
I believe that you are referring to the option under WooCommerce > Orders > Order Actions > Email invoice / order details to customer, correct?
If yes, by default this email can only be sent to the customer’s email address. You can also check it under WooCommerce > Settings > Emails> Customer invoice / Order details
Should you wish to send it to a custom email address, this would require a plugin or a custom code to do this.
You could check the premium plugin PDF Invoices for generating invoices on your site.
I understand that you would like to add an accounting email to receive the invoice, in addition to sending it to the customer.
I haven’t found any relevant solution that could be a good starting point here. But you could check the resources below if this is possible thru customization. Unfortunately, custom coding is not something we can assist with directly. However, I’ll keep this thread open for a bit to see if anyone from the community can lend a hand.
If you have any other questions related to development or custom coding, don’t hesitate to reach out to some of the great resources we have available for support. The WooCommerce community is filled with talented open-source developers, and many of them are active on the channels listed below: