Hi PL, also from what I can guess from the file name of the image you attached, you're trying to edit the curve and then update the surface that was built from it?
MoI does have a history update mechanism that will allow you to do that, but it's limited in several ways and the biggest limitation is that the "history chain" will not persist through certain operations like doing trims or booleans.
So if you do a sweep and then right after you have finished that sweep before you do any booleans you can edit the curves that were used for the sweep and the sweep will update. Once your sweep is booleaned to other objects you will then lose this ability to do a history update of it.
In the future I want to improve the history mechanism to make it possible to have a deeper history update function that will persist across different kinds of edits, but it's a lot of work to make that work well. For now if you have done other kinds of edits to the sweep you just have to delete the sweep and make a brand new one using your newly edited curve.
Also sometimes the Transform > Deform > Flow command can be useful for taking a flat object and making it follow a curve, that's a different way to adjust something to follow a curve... If I could see your 3DM file it would probably help me to understand better what you are trying to do and then be able to give you some better feedback.
- Michael
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