Editing a custom group is performed in the same way as creating one.
Changing the type of group will result in its conversion. Any custom group can be converted to a dynamic group if it was static, and vice versa.
When converting a static group to dynamic, provide grouping criteria. All the members that exist in the static group that do not match the provided criteria will be removed from the dynamic group.
When converting a dynamic group to static, two options are available – either to leave the current content of the group or to empty the group.