If you have deleted an interior elevation from the group and you wish to bring it back later than instead of creating a new group you can follow the below step to restore.
Select the IE group < right click and from the context menu go with the option of “restore all interior elevations in group”.
![restore all interior elevations in group](http://localhost:8080/wp-content/uploads/2021/05/Screenshot-2021-05-27-220731.png)