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It's great to have you here, @eric24.
I can definitely walk you through deleting your invoice templates.
Once deleted, the previous invoices in which the deleted invoice template was applied will still retain its formatting and style.
Also, I've added these articles to help you in adding a personal touch to your sales forms:
Get back to us here if you have other questions about managing your invoice templates and other sales forms. I'm always here to help.