It would be best practice if limited company registration numbers could be added during set up and then selected to be included on sales invoices.
available if i'm undersstanding you correctly
go to "settings" - "PDF Themes" - choose the theme you are using for your invoices
go to "misc options" - in the document footer left box (which will appear in the centre of the footer) i put "registered in england etc No 56712345
hope it helps
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