From what I've seen you make ALL features up to and including the one you pick as "read only". I haven't seen a way to just make a single feature in the middle of your model tree read only. Read only can also cause issues with family tables. What you CAN do, for a single feature, is use relations to lock the dimensional values, essentially making only that (or whichever you choose) feature(s) read only. That's really the only way I've found to do what it seems you want to.
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