More information may be needed. Do you want the line numbers to start over on
each new page or is the number consecutive throughout the report. Also, do you
want to number just the detail lines or every line including title lines,
summary lines, etc.
Simplest - number every detail line only.
Add a new control to the detail section
Set its properties as follows:
Control Source: =1
Running Sum: Overall
Try that and see if it gives you the results you want. IF not, then post back
with a little more detail on what you do want.