You can delete dimensional data from orthogonal pipe and from skewed pipe.
Orthogonal Pipe
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Select the dimension you want to delete.
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Select Dimension > Clear Length Command.
The selected dimension is deleted.
Skewed Pipe
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Right-click a skew leg, and then select Clear All Skew Dimensions.
All the skew dimensions are deleted.
Clear All Skew Dimensions is available only for 2D and 3D skews.