vlaardim,
You could do it using Metadata. Before you send the data to Image, you can add a "Create Metadata" action to create metadata for the job. This is like data on the job, such as total number of pages, datapages, etc...
Once you have it, if you want to assign this value to a job info, you can use Set Job Info, and use the following syntax to get the value in a job info:
GetMeta(SelectedPageCount[0], 11, Job.Group[0].Document[0])
This will give you the number of pages in the document. After that, you can make conditional branches on that job info to organize the jobs the way you want.
Hope that helps!
Regards,
Raphaël Lalonde Lefebvre