I think that copy/paste only works on 'objects' so you would have to make cuts at the ends of your range first. If you're not going to further editing you could export only the range and paste that new clip in at the end.
You can copy/paste/delete/extract a selected range as you need - however it does have a small 'gotcha' - you may get a few frames less then you expect as the actions work from the first full frame to the last full frame.
So if the selected range starts or ends at an intermediate frame you will lose these.