Another doubt : are the values in the second column numbers or text or a mixture of both ? If they are numbers , will they be single-digit numbers , or can they be of any value ?
Concatenating and getting the several values in one cell is not possible through formulae , in my opinion. Is VBA acceptable to you ?
Using formulae , you can put the multiple values in several columns , and then use a separate column to concatenate the values in these columns. Check out this file here :