VMS Help CMS, INSERT, ELEMENT, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The INSERT ELEMENT command places one or more elements or groups
    into one or more groups. The groups must already exist. When you
    use the INSERT ELEMENT command with a group name, you insert the
    contents of the group. For example, if you insert group A into
    group B by using the INSERT ELEMENT command, group B will contain
    the contents of group A at the time of the insertion transaction.
    If the contents of group A change at a later time, the contents of
    group B are not affected. To insert a group into another group,
    use the INSERT GROUP command.