Sale invoice items

[d3mad]

Use theme and create a custom theme to change the title

[16.11.1] Added new themes for invoices, quotes, orders, receipts etc

You can’t make theme specifically for invoices. Themes are always universal (this is on purpose). But that shouldn’t be an issue. In theme, where {{ title }} variable is used, simply replace that with: {{ title | replace: "Invoice", "Tax Invoice" }} This will apply replace filter to title variable so if it contains Invoice, it will be replaced with Tax Invoice.

untried, but this could work:

{{ title | replace: "Invoice", business.name }}

tested, works: