I need to enter a lot of numbers that look like "0.000124". There are always
3 leading zeros after the decimal.

I'd LIKE to just ENTER "124" and have excel convert it to the "real" number
automatically (sort of like if you enter 40 in a % formatted column, it
automatically converts it to 0.40).

Do I have to use a formula, or is there a custom format that would work?
Thanks!