To copy only a part of a strip I want to copy a 3.5 minute sequece from a movie of about 2 hours, because I want to subtitle it and use it for a lecture of my own. I used the knife tool to cut away everything before and after this sequece. However , I am not able to copy it (Ctrl C) and paste it on anther track. There are no handles on the little sequence and the timeline stays the same: I do not manage to have my little strip starting at position zero. It is a free video, no copyright problems.
It is only the second time thet I work with the video editor, I am relatively new to Blender and use version 2.79.
Thanks to anybody who can help,
Jos
Use Duplicate Strips. You'll find it in the Strip menu:



If you can't select a strip, then it may be too small and you can use the horizontal scrollbar handles to zoom in. After that, you just select it and drag it to where you want it. 

To make sure you only render the part with a strip, use this function to limit the render range: