Insert the same element into a 2D array of strings

Hi, 

I have an array of rows and 1 coulmn and I would like to put one element in all the specific places

For example lets say the column is 2 and the array of rows are 1,3,4    and Data is 122 

so the array shoudl look like this 

              Coulmn 1          2         3            4             5 

Row 1                            122             

Row 2

3                                    122

4                                    122                                        

5

I have tried insert into array and Repalce Arrat Subset but still I couldn't do it

Thanks