Hi @Jin Wu ,
I'm assuming that Legend is an issue type? And are you referring to the Advanced Roadmaps Parent Link field?
If so, you may need to do a few things to enable this:
1. Go to your Hierarchy Configuration
and add the Legend issue type to the level above the Epic
2. Go to the screen scheme configuration for the Epic in the respective project and add the Parent Link field to the create/Edit/View screens as necessary.
Now, you should be able to see the Parent Link option on your Epic.
Once again, I'm presuming that you are referring to Advanced Roadmaps and an issue type.
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