Staad Group

Is it possible to define a Group which is composed from other Group definitions? 

For example: 

START GROUP DEFINITION

MEMBER

_+X_PLAT_BR_OUT 10 TO 20

_+X_BODY_BR_OUT 20 TO 30


_COMBINED _+X_PLAT_BR_OUT _+X_BODY_BR_OUT

END GROUP DEFINITION