This is a very important and powerful feature of Microsoft Excel,
and one you must learn.
The procedure to copy data or formula in a cell to neighbouring
cells is as follows:
1
Select the cell you wish to copy by using your mouse and
clicking the left mouse button.
2
Then click your left mouse button and hold down on the "fill
handle" which is located in the bottom right corner
of the cell as in the illustration on the right.
You must point exactly at the bottom right corner of the
cell. The cursor will change from a white cross to a black
cross when you point at the exact place.
3
While keeping your left mouse button down, drag downwards.
You can drag downwards as many cells as you need.