How do I post a bill for a machine and a self billing invoice for a machine being offered in part-exchange

Hello Dimo_60, thanks for posting on the Community page, we would advise you speak to a trained and qualified accountants one how and the best way to enter this into your account as we are just technical support not trained accountants.

Hi @dimo_60 

You will need to raise an invoice in QBO for the machine you're part-exchanging (attach a copy of the self-bill to this in QBO for your records).

Enter the Bill from the Supplier into QBO at full value.

Enter the Bill Payment into QBO for the actual payment amount.

Contra the balance in QBO - there are a few alternative methods for Contra (search on here).

Hope this helps.