There are two ways to delete sub-entities. One is explained in Entity Deletion and the other is to delete it in the list page by using the Delete button on the toolbar. In this case, the target entity in the list page must first be selected before clicking the Delete   button. Before deleting a sub-entity, dependencies of that sub-entity must be considered. For example, a function expression might be used in a force or motion defintion. If a simulation error occurs after deleting a sub-entity, its dependency must be checked.