hi

I have a spreedsheet that has cells that are repeated amongst others I want
to write a function that will identify these.
if column A has this data in it how can I pick up the identical cell in
Column B
DMM9844
DMM9844 1 - this what I want in col B.
DMM9756
DMM6456 1
DMM6747
DMM3463
DMM4574

i think it may be a sumif function but i can't get it to work. Can anybody
help?
Thanks