Insert a page into sorted output

Running my job separated by a data type, want to insert a section as a banner page when the field changes. Cant seem to find a starting point, assuming a post paginate script would work.

Hi decrabtree,

Do you want something that triggers a Splitter section with variable data when a field changes value?

So say you have sections:
Splitter
Letter

Data with a field for each record containing the following:
Field1
001
001
002
002
0009
0009
0009
12345

So when you print to lets say PDF, the output would be:
Letter
Letter
Splitter
Letter
Letter
Splitter
Letter
Letter
Letter
Splitter
Letter
Splitter

I have something very old that does something like that if you want to take a look.

I could be way off but just a thought.

Regards,
S