It is beyond frustrating using these barebones built in ugly templates.  How can I add customer name to subject line of invoice templates we can easily retrieve from our inbox via company name, vs only showing invoice number, which helps NOONE.
That QB no longer offers option for users to upload custom forms (gone from QB lab) is ridiculous.  QB Templates are pitiful  three fonts, severely limited options.  
Tried adding [customer display name] [fullname] and other variations which appear within email, but they do not work on subject line.  Beyond frustrating and disappointing. QBO all hype with minimal functionality.