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Level 10

Hi Jing,

I don't think it is easy, here is a sample that allows you to choose the page size and orientation (which are different master pages), Adobe LiveCycle Designer Cookbooks by BR001: Season Planner (or Year Planner) PDF Template

It effectively defines the form against each master page and recalculates the widths and heights when the page selected is made, but I don't know of another way.

Regards

Bruce