Mark Shacket

Hello, and forgive the simple question. I've spent a few hours trying to find this answer online and have been unsuccessful. If I use MIDI to create a groove loop, how do I make it so I can change the original loop element and it applies to all of it. For example, if I make a 1-bar phrase, and drag it for 8 bars, how can I then make a change to Bar 1 and have it apply to all 8 bars? Is this possible? Thanks for your time.