Hi,
- Creating the HTML invoice, or PDF invoice
- Sending those invoices to buyers
etc.. those are not handled by templates. They are 100% related to core (Virtuemart Core). Our template has absolutely nothing to do with invoice creation.
Check this folder:
ROOT ▸ components ▸ com_virtuemart ▸ views ▸ invoice
The PHP files within that folder are responsible to create the invoices. (Unless you use 3rd party plugin for Virtuemart Invoice creation)
I would also recommend you to check
forum.virtuemart.net or google.com
You might find a solution about this.
Regards.