Today the user asks how to create or delete feature data. I think this is very simple task. Just use copy/ remove command or create new feature from geometry.... But she said it really doesn't work!!!

Eventually I know why, it caused by "data join". The feature data has connected one external table. Actually you can create new object, but the map 3D will be run very unstable and hang up finally. It's better to disconnect the data join first and then create new feature objects.