Click on Format Cells Boarder

There you will find that you can apply a double line to the bottom of a
cell. That will display the double line under a number.
Also you can use a boarder to have a line extend across cells.

Hope this helps.
Michael S.

"Lindsay" wrote:

When working on a financial statement, I was curious how to 1. Have a line
extend across an entire cell even if the number is only 2-3 digits and 2. How
to apply a double line under a number without using the = sign in the
following cell?