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Next, go to Concepts > Lines from Sketchs. Select the line you just drew and click Base Objects > Apply, followed by . Now that you have created a vertical line, create a new sketch and repeat the process for a horizontal line that is collinear to horizontal axis and bisects the geometry.
Now, we need to project the lines we just created onto the surface. Go to Tools > Projection. Select Edges press Ctrl and select on the vertical line we drew (you'll have to select both parts of it), then press Apply. Next, select Target and select the C-Mesh surface, then click Apply.