bigbob63 - here's an additional / alternative suggestion. You can do the following steps for an individual selected track, for a few selected tracks, or for all the tracks in a song. Works the same in all cases.
1. Select the track or tracks
2. Figure out what measure and beat is your starting point for the copy. That will show in the blue display at the top if you click your mouse to put the timeline at the desired starting point. If the starting point is say the beginning of measure 21, just remember this: 21 1
3. Figure out what measure and beat the copy section should end at. Let's say it is 8 measures, then remember this: 29 1
4. As long as the correct track(s) is/are selected, under the Edit menu choose Select By Time.
5. For the starting time put in say 21 1, and the end time say 29 1
6. Then you can Copy. Control C copies just the data. Control Alt C allows you to select more stuff to copy, like the markers.
7. Paste is Control V, but Control Alt V (paste special) is much better because with that you can indicate where you want to paste it in the timeline and starting on what track ( if you're copying/ pasting all tracks you'd paste beginning from Track 1).
Say you want to paste measures at measure 105. You would put starting at 105 1
This is a very surgical method and precise. It's easy if you do it once or twice to get the feel for it..
Also you can use the same technique to Cut a piece out of the song, or to create 8 measures of new space, etc.