Hi Jeff,
Here's one way...
Step 1) In the adjacent column (perhaps insert a temporary column if necessary), enter this formula:
=FIXED(A1,2,0)
The second argument (2 in the above example), is the number of decimal places you want the text to show.
The third argument (0 in the above example), will cause a comma to be used. A "1" will cause no comma.
Therefore, using the above example, if A1 contains the value 12345, the result will be: 12,345.00
Step 2) Copy the formula down to match the number of rows of numbers in your column.
Step 3) Highlight and Copy the formulas.
Step 4) Use: Edit - Paste Special - Values
Step 5) Copy the (text) values to replace the numbers.
Step 6) Delete the column where you had the formulas.
I hope this helps.

Please advise as to how you make out.
Regards, ...Dale Watson dwatson@bsi.gov.mb.ca