Library /sys$common/syshlp/lse$clihelp.hlb RESERVE, Qualifiers, /MERGE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /MERGE=generation-exp
       /NOMERGE (D)

    Determines whether LSE merges another generation of the element
    with the generation being reserved. If you omit this qualifier,
    LSE uses the setting of the command SET CMS/[NO]MERGE to determine
    whether to merge generations of the element being reserved.

    You must enclose generation-exp in quotes (" ")  if
    nonalphanumeric characters are present.