Modifying section view lines

Hi,

I'm trying to add more lines to the section view line - I have a part with several staggered rivet holes, so the line snakes through all of them.  I missed a hole and need to add more lines to the section line, so I right-clicked on the section line and chose "Edit Sketch."  I tried adding new parts to the section line, sketching the new lines with just a normal line and then a centerline, neither of which were recognized when I clicked "rebuild."  I'm using SW 2009.

Thanks,

Brian

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