Place and group the key points in the symbol.
It is easier to select the points by having only the Points layer displayed. Click Layer Status and select Active layer only.
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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.