If you are grabbing everything in a multiple line template, then you can sometimes handle this using Advanced Field Properties - with the relevant field captured based on a preceding string in the same or the previous line. Or you can use Appends and Footers and make sure these are Cleared By the Detail.
There's nothing that can be modelled - and if you need it done over the weekend then there are some experts who can help for a modest fee.
All the best,
If you may, please send the reports to email@example.com and the Datawatch Support Team can open a ticket for you. We will try to replicate the issue and suggest possible solutions. Also, we have the Professional Services Team that can create the entire model for you.