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Start by creating a sketch on the XYPlane. Under Tree Outline, select XYPlane, then click on Sketching right before Details View. This will bring up the Sketching Toolboxes.
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Click Here for Select Sketching Toolboxes Demo
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Click on the +Z axis on the bottom right corner of the Graphics window to have a normal look of the XY Plane.
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Click Here for Select Normal View Demo
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In the Sketching toolboxes, select Rectangle. In the Graphics window, create a rough Rectangle by clicking once on the origin and then by clicking once somewhere in the positive XY plane. (Make sure that you see a letter P at the origin before you click. The P implies that the cursor is directly over a point of intersection.) At this point you should have something comparable to the image below.
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Under Sketching Toolboxes, select Dimensions tab, use the default dimensioning tools. Dimension the geometry as shown in the following image. 
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Under the Details View table (located in the lower left corner), set V1=0.1m and set H2=8m, as shown in the image below. 
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Surface Body Creation
In order to create the surface body, first (Click )Concept > Surface From Sketches as shown in the image below.
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