Use existing feature dimensions, like total extrusion distance, in new feature
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Let's say I'm making a box, and I have the wall/floor thickness set as a user parameter - "thickness". I want the internal depth to be, say, 20mm, but I have to take into account the floor thickness, so I extrude by "thickness + internal_depth". This is now the external depth of the box.
Later I want to extrude something else, but I want to extrude it by the result of this previous extrusion. Now, I can just extrude it by "thickness + internal_depth" but that seems like I'm repeating myself. If I were editing a sketch I could click on an existing dimension and use that in a new dimension calculation, but how do I do this with features like extrusion? As far as I can see, there's no "3D dimension" tool that creates a dimension I can click on when entering the extrusion amount.
Now I know this is a trivial example, and I could just create an "external_depth" parameter equal to "thickness + internal_depth" and use that in both places, but in reality I actually have a much more complicated extrusion sequence, which gives me a final extrusion that is not a simple expression. I'd quite like to just be able to click on the final depth of that extrusion sequence and use that value for a new extrusion - can this be done?
Another situation is where the extrusion has been done "by eye", perhaps as part of a more ad-hoc sculpting workflow, so the exact extrusion distance is arbitrary and not easy to calculate with parameters. I can use the measuring tool to get the numeric value, but that won't be linked to the actual extrusion, in case it's changed later. So a way to somehow link a 3D dimension to a feature specification would be very useful.