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then you can delete original b, c and d
you would be using some thing like this
=IF(ISERROR(VLOOKUP(A2,[Book1.xls]Sheet1!$A:$D,2, false)) , A2,VLOOKUP(A2,[Book1.xls]Sheet1!$A:$D,2, false))
which basically says if the value is not found in book2, then keep original value else get the updated value