Edit Filled Region Boundary

Hi everyone.
I am trying to offset the boundary lines of the selected filled region. This script is not giving any error, but at the same time there is no change in the model.
The main purpose is to able to resize all selected filled regions at once.
Maybe, any idea?
Thank you
Tom

This is usually the way to go.

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This may help: I want to edit the sketch of an existing floor or slab

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