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Select the Points layer on the Layer toolbar.
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Click Point on the vertical toolbar.
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Place points on corners and edges according to the conventions described in Key Points.
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Constrain all points to the profile contour geometry.
Constraining to the Default geometry is recommended.
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Shift-click to select the points.
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Click Group on the Change toolbar.
It is easier to select the points by having only the Points layer displayed. Click Layer Status and select Active layer only.