It is easier to edit on the following song: 【Project DIVA 2nd】 その牡丹、艶やかなれば 【エディット譜面】
Unlink from this group
(This song will stop sharing the "Music Map" with the following group and have its own "Music Map")
You can click "Link to this group" only when its candidate is completely same with the current song. The candidate will join the Same-Song Group and share the "Music Map" and "Edit History".