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If I understand your question correctly, you can try the following:
1. Use Add Field tool (Data Management toolbox - Fields toolset) to add a field for distance values.
2. Use Calculate Field tool (in the same toolset) to calculate the distance field with multiplying the line number field by 10.
3. Run the Buffer tool and specify the distance field. It should create buffers according to the distance values.
4. If you need the output as lines, run Polygon To Line (requires ArcInfo license) - uncheck "Identify and store polygon neighboring information" option (this option is new in ArcGIS 10) to convert the polygons to lines.
Hope that works for you.
Dear Lee, thank youo very much for your solution, are there other way for this situation?
I should have mentioned that the output of Buffer contains enclosed shapes, not exactly offset lines. So you would need to do some editing work.
There might be a proper editing tool to do this. You can try to post your question in the Editing forum: