Unfortunately, there is no such functionality in Creatio yet.
The only way to create a new version of existing process is to save it when at least one instance of this process is running or new version cannot be saved in it's package (happens when a process has been imported as a part of some package into the system).
We already have a proposition created for the responsible R&D team to implement functionality which would allow users to create a new versions of the process despite of conditions mentioned above.
I will pass this post to them so to increase the importance of it.
