so can you project a 3D sketch convert entities does not project it true, if you measure the part and measure the convert entities it's not right. So can this be done in SW?
yes, but it depends how or on to what you are projecting. it will measure differently because you are taking 3D data and translating it to 2D so it is "true" to whatever direction is normal to your desired projection.
this is a pretty open question. maybe you can attach your file or supporting images to further describe your problem.
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