Hello James,
There definitey is an option in ArcGIS 10 to do what you need. Below are the steps to do it:
- In the editor toolbar, click Editor -> Start Editing.
- Select the line segment that you want to split using the Edit Tool.
- Again, click on the Editor drop-down and choose 'Split...'. The split dialog box opens.
- In the split options section, choose Distance option and enter the splitting length.
- You may also choose if you want the splitting to begin from the start or end of the line segment in the orientation section of the dialog box. Click OK.
Hope this helps!
Thanks,
Saisudha Vivekanandan | Desktop Analyst, Support Services | Esri