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Select subcurve in a curve

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Hello,

I need to select subcurve within a curve with python

the curve from which I need to select a subcurve is consisted of several segments, so it has subcurves

from help files I created a script:

    object = rs.GetObject("Pick a curve",filter=4,subobjects=True)
    print object.GeometryComponentIndex.Index

it works ok for solid, it returns different index for edges, but for closed curve it always returns -1

further I use the following to get and create subcurve, but it works only with solid edges

    curve = object.Curve()
    sc.doc.Objects.AddCurve(curve)

Thanks in advance
Aleksandar

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