What I have is two coumns of numbers, in one column is a list of all possible numbers to use, other column is ones in use. (Try to track a list of available voicemail extensions for new employees.)

So in Column A I would have:
1
2
3
4
5

and in column B I would have:

1
2
3

What I'd like it to do is create a new column or array with the numbers that appear in A, but do not Appear in B. And I've been unable to find a better way then just going through entire list and looping through doing compares to used numbers. It's using 200 numbers right now but will be growing when i start doing entire list. Is there a quicker way or some built in function to make my life easier? Thanks in advance for any advice.

Krager