Just use a succession of IF INGROUP to make appropriate changes
code:
IF INGROUP(Group A')
  ; do stuff
ENDIF
IF INGROUP('Group B')
  ; do other sutff
ENDIF
Alternatively, if the groups are mutually exclusive, then you cna also use SELECT-CASE-ENDSELECT like
code:
SELECT
CASE INGROUP('Group A')
  ; do stuff
CASE INGROUP('Group B')
  ; do other stuff
CASE 1
  ; do stuff for members of neither Group A nor Group B
ENDSELECT
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