This is absolutely insane.  Good grief, this can't be that hard to implement!  If I do a google search of this topic, there's many requests for this feature going back years and years and, true to Intuit form, there's been zero effort to add a simple text box to an invoice that merely copies text from the project name--WHICH IS ALREADY IN THERE!!  I'll be finding another solution for invoicing, costing me more money to get a simple line of text shown on an invoice.  Ridiculous.