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how to make those insible sketch hidden

Question asked by Yin Bruce on Nov 6, 2019
Latest reply on Nov 7, 2019 by Yin Bruce

R.E.F the attached picture.

The red line segments are generated by Sketch20.

Now what I am curious is, these two line marked by ellipse should not be visible, because the flange of sheet metal covered these two lines. This is in line with reality.

I just can hide/show the whole sketch.

Does anyone know how to make it realistic?