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I have 2 types of Polygons. one big Polygon (P1) and multiple smaller polygons (P2) all located inside P1.

Is there a way to get the line segments that intersect/touch?.

Running "Geoprocessing Intersect" gives me the polygons. I only need the actual lines segments that touch not the whole polygons.

I'm attaching an example image, I need to get the red line. Is it possible to do this automatically? Get Intersecting line from polygons

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In the GRASS toolbox, you can use :

grass.run_command('v.overlay', ainput=yourlines, atype='line',
                           binput=polygon2, output=result,
                           operator='and', snap='2')

You can adjust snap value if your lines not exactly overlap the polygon limits.

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