Yes, it is possible for more than 1 party to appear on the invoice.
The invoice will show the school as the Sold To: and the Trust as the Bill To:
If you only require the Trust to be on the invoice, but you are the payer you will receive the invoice to make the payment. The invoice will show the school as the Sold To: and the Trust as the Bill To:
We would require the Trust details, including the full name and address, as well as a full finance contact name, phone number and email address, in order to add them to the invoice.