Removing Solidworks feature references

Let's say you had a feature, Shell1, at the beginning of your feature tree, and it is the feature that generates the solid body used by the rest of your feature tree.

Then you go and decide you want to use a Thicken (or something) instead of that Shell1. And then Shell1 breaks.

Now you're left with a ton of sketch and feature references back to the original Shell1. You manually reattach your sketch references to the new solid body, but you find that your features still reference Shell1. And if you delete Shell1, these features will also disappear. How do you update them?

If you create another, separate solid body (so now you have more than 1 solid body in your model), this activates the "Feature Scope" options in the feature, and now if you Edit Feature, you can select Thicken1 and the features will stop referencing the now-defunct Shell1.