Problem with splitting line

Discussion created by manolito69 on Aug 24, 2012
Latest reply on Oct 11, 2012 by jthompson88
Hi everybody!

I have a problem with splitting a certain line. The message "Select a single editable line to split" appears even though I have selected the line correctly in the editor toolbar. Said line is a former polygon (of a state border) so it has no start or end point. Could this cause the problem?
In fact, at the point where the line should be cut, I want to continue with another line (the final goal is to produce a new polygon out of various segments of lines) so I also tried to trim the first line but that didn't work out either. Maybe there's also a much easier way to reach my goal. I'm rather a newbie with this kind of editing features.

I'm attaching a word file including a screenshot for better understanding.

Thanks for any help!