Excel - Populate multiple cells based on another cell value

Question

I have the below table on the excel

     A           B         C         D
Total Errors   Error_1   Error_2   Error_3
     3
     2
     1

need a formula to populate cells from B:D as shown below.
The output to be :

     A           B         C         D
Total Errors   Error_1   Error_2   Error_3
     3           1         1         1
     2           1         1
     1           1

Thanks.

Answer 1

In B2 enter:

=IF($A2>COLUMN()-2,1,"")

then copy this cell both across and down.