Versions are a great way to keep your score organised if you start making multiple edits to the same piece, start trying out various ideas or simply want to maintain multiple alternate versions of the same piece of music with one score file.
You access the Versions screen by tapping on the Versions icon 
found in the command bar.
Every score is created with a Version 1 already in place, which timestamps when the score was created or imported.
A "Version" is a exactly what it sounds like -- a version of the score. When you create a new version, by tapping the "+ New Version" button, you basically create a snapshot of the version you're currently working in, at that point in time. You're asked to name the new version you're about to start working in. Press enter after naming it, and give it a description. The new version is highlighted in bold, and a blue dot appears next to the name to indicate it's the active version.
Now you're working in a completely isolated, separate version of the score. The previous version is preserved, and anything you do the score whilst this version doesn't affect any other versions. You could delete sections, move notes around, change the key, change the structure, or completely rewrite an entirely different piece if you wanted to... Versions work completely independent of each other.
If you decide you need to go further, you can create a new version again. New versions "split" from whichever version you have open. So, you could go back to Version 1, and create a new version from the original score. Or, you could create a new version from your most recent Version. It's a powerful concept.
Tap the "..." more icon to reveal a few more management options. From here you can:
- Change the Version title and description by tapping the
icon - Delete
the version you've selected. Note: If you have only one version of your score, you can't delete it - doing so would delete the entire score!