I, too, have two businesses that I needed to create invoices with the two separate logos and company information displayed on the invoices. I went through these steps to create the 2nd location, and that worked great. I tested being able to select the "new location" aka 2nd business when creating an invoice and see that I'm able to do that.  All is good.

The issue I'm having is this: When I created the new invoice template with the 2nd business logo (this worked-saved) and return name/address, but when I edited the return portion on the NEW 2nd invoice template, it overrides that same return address information on my 1st/Main business invoice template.  I tried to switch it back on the invoice template for the 1st business, and it overrides that same return address on the 2nd business invoice template. It doesn't seem like you can have 2 separate return addresses on the templates, unless I'm doing something wrong. Can you help me with solving this?