I saw another user had begun a forum thread about this functionality because I was searching how to do a similar thing.
I added my query and was asked to raise a ticket. Unfortunately, this functionality is not supported and so it was suggested to me to create a suggestion and see if it can get upvoted by the community.
I have setup direct bookings via OwnerRez to capture the leads I'm getting from my website. It struck me when sending quotes to people that sum of the vital, initial payment and deposit information is a bit 'hidden' by them having to scroll through the rental agreement after adding their contact information. Editing my 'confirm & pay' form has allowed me to highlight the main parts of my payment conditions but I can't make it specific to the client without the ability to add field codes.
I hope this will help others too (screenshot below).
Andrew,
Your original ticket has been escalated for more review. If the 'Create Form Message' dialog for the confirm and pay form includes the 'Insert Field' and HTML formatting, then it seems like it should work. So we need to find out why it doesn't, and if it can be made to do so!