If you go to the main cog wheel> account and settings>sales> sales content> referred invoice terms > add new> fill in information>save> save and then you can select that term in your invoices when you create them.
If you go to the main cog wheel> account and settings>sales> sales content> referred invoice terms > add new> fill in information>save> save and then you can select that term in your invoices when you create them.