Edit span segment with Span Boundaries and Strip Boundaries
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Select the span segment between grid B3 and C3.
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Right click on the plan and choose Selection Properties from the popup menu.
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Change Span Width Calc to Manual, and click OK.
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Select the Span Boundary Polyline tool ().
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Click at point A as shown in the previous figure.
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Click at point B.
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Right-click, and click enter.
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Click at point C and D.
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Right-click, and click enter.
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Select the Strip Boundary Polyline tool ().
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Click at point E as shown in the previous figure.
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Click at point F (the corner of the opening) and point G (another corner).
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Right-click, and click enter.
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Select the span segment between grid B3 and C3.
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Click the Generate Selected Strips tool ().