Concatenating into string

Hi experts,
I am looking into a simple concatenating logic.
User enters more than one option in selection box.
I want to display as
Sel1,Sel2,Sel3
I try  way as given below but every time workspace variable bus_areas get clear and i retain only last value followed by a comma.
Data :bus_areas(60) type C.
loop at s_gsber.
concatenate s_gsber-LOW ',' into bus_areas.
endloop.
How can i achieve SEL1,SEL2,SEL3

Hi,
Data :bus_areas(60) type C.
loop at s_gsber.
concatenate bus_areas  s_gsber-LOW   into bus_areas seperated by ',' .
endloop.
Can u please be more clear while asking questions.
Regards,
Jagadish

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