Group the graphics that define the bracket into a unique group.
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Shift-click to select the lines and arcs that define the contour of the bracket output. Do not select points, construction lines, dimensions, or constraints.
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Click Group on the Change toolbar.
It is easier to select the geometry for the group by having only the Outputs layer displayed. Click Layer Status on the Layer toolbar, select Active layer only, and double-click the Outputs layer to make it active.