Create the slot geometry.
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Sketch the slot on the Default layer.
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If construction lines are needed to help constrain the slot, sketch on the Constructions layer.
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Constrain the slot to the profile. Do not over-constrain.
Do not use horizontal and vertical constraints. These constraints will keep the slot from adjusting to the profile orientation angle. Use parallel constraints instead.
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Dimension the slot on the Dimensions layer with respect to the profile.
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Variables are automatically created for each dimension. If you need to refine the variables, click Tools > Variables. Rename, change default values, and add formulas as needed.