I have an extruded surface which is referenced to a sketch (by contour selection) and I need to unslect this sketch and choose another, as I am not able to modify it due to it being referenced elsewhere in the model.
Am I able to choose another sketch for the extrude feature to use as deleting the surface would fail many more features within the tree. Do I really have to unlink this surface from all it previous features first in order to do this as opposed to selecting another sketch and then redefining the resulting/subsequent failed features?
I don't believe you can edit a feature to have it reference a completely different sketch. Assuming the other sketch is above (or can be moved above) the one currently being used you should be able to edit it, use the "Convert Entities" sketch feature on the other sketch, then edit the feature to use this new contour.