Skip invoice generation by price or coupon code

Hi,

I’ve created a coupon that adds a 100% discount to a given order so I can submit orders that pre-created offline (outside of the website) and already have their own invoice. When I’m doing so, I want to skip the invoice creation – is it possible to do it by coupon-code or by price? (already saw that it’s possible by payment method).

Best regards,
Tom