If you are struggling getting this working with the built in editor try exporting to RTF and edit in MS Word then import. Think that's how I managed to get it to work now I think about it a bit more.
what do you mean by import?
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my templates within EA are correctly (mixed) in A3 and A4
but using the document generator class, it only size my diagrams to A3 but do not define the page as A3 (well it keeps the size definied when i use Newdocument() ).
I tried by defining printer setup as A3 in a template --> KO
edit section style A3 in a template --> KO

EDIT :I tried using F8 + generating my template.
All goes normaly (A4/A3 mixed).
So the problem seems to be that the document generator class does not work the same way as the generator.
For example :
docGenerator.NewDocument("Normal A4") ;
docGenerator.InsertText ("STUFF", "heading")
docGenerator.DocumentDiagram(theDiagram.DiagramID,level, "A3 Diagram Landscape");
Will not insert fully the template. It will only treat the object (here diagram) as in the defined template(a3) and past it in the destination document(a4) (a3 img in a a4 document).
If someone can confirm that.
That is a real issue since i can't get the same order of generation using only templates (that i do with scripting) since EA manage object using Breadth First Search tan i want to use a Depth First Search method.
If anyone has a solution that will allow me to use A4 and A3 using the document generator class, i appreciate.
I know that this is possible using the F8 solution but that will not comply with the work i am tring to do.
THANKS