Hi Christopher, you may be wanting to use a different kind of CAD program for that type of editing - one that's called a "feature based parametric" CAD program. Those are the ones like SolidWorks or Solid Edge where they keep a list of "features" that went into constructing the object and allow you to edit the features and have the model update.

Those systems can work really well for the types of edits that you are describing. MoI does not currently have the full set of that same functionality, the focus in MoI is much more on just drawing things quickly the first time and not so much on editing built things later on. So in MoI you'd mostly do the workflow that you are describing like edit the curve, re-extrude it, etc... The exception is that MoI does have some limited amount of history in it, if you generate an extrusion from a curve in MoI it is then possible to edit the curve and the extrusion that was created from it will update but not if you have done other operations on the extrusion like additional booleans after the extrusion was finished.

I do want to implement a deeper history function in the future but if that's something you really need a lot right now you would want to look into those parametric CAD programs which are focused on that type of thing right now.

- Michael