how to populate actual arm based on the values.

[Rajesh42z]

1. ARM = DRUG X in IWRS data, but EXTRT in IWRS reflects both DRUG X and DRUG Y throughout the study, then we leave ACTARM blank, populate SUPPDM.ARMNRS and SUPPDM.ACTARMUD.
2. ARM = DRUG X in IWRS data, but EXTRT in IWRS reflects only DRUG Y throughout the study, then ACTARM = DRUG Y, leave SUPPDM.ARMNRS and SUPPDM.ACTARMUD blank.

    3) if ARM = DRUG X in IWRS data,  EXTRT in IWRS reflects DRUG X only, then                       ACTARM = DRUG X, leave SUPPDM.ARMNRS and SUPPDM.ACTARMUD blank.

arm=1 
druga drugb drug c drugd

arm=2

druge drugf drugg drugh

how to program it

[andreas_lds]

Please post data in usable form and the expected result.