Creating a new version, or cloning a copy of an existing theme, is possible for any theme including the currently active theme.
To create a new theme:
Open the Design page and click Theme.
Note: When you are designing your web store for the first time, the currently active theme is displayed with the Active icon highlighted and a message instructing you to clone the theme before customizing settings.
Click the Clone Theme button.
You are now prompted to name your new theme.
Enter a unique name for the cloned theme.
Click Save to confirm.
You can also click Cancel to return to the active theme.
Click the Activate Theme button to activate the new theme.
Alternatively, you can also choose to make another copy of your newly cloned theme by clicking the Clone Theme button.
All configurations related to the activated theme are now available to view or customize.