@Jianxia great to hear it is being worked on!
I want to raise an issue with the Cut tool when working with features in a relationship:
In WAB when cutting a hole in a polygon that has a relationship to a table, the hole remains related to the table and the larger polygon loses the relationship.
In Pro it is the opposite: creating a hole using Split preserves the relationship in the larger outer polygon, and the hole loses it.
In the Experience Edit tool, is there any way that both features can retain the relationship?