Hi,
You can copy the whole process as a new process.
Next to "Save" button (floppy disk icon), there is "Copy" button (multiple floppy disks icon).
This will create a new process with same setting - except for custom measures.
You can't copy a part of process, like a few Activities, into another process.
If you really needed to do this, the best you can do is to open 2 browsers and go back and forth between the two, copy&paste all the scripts you defined.
For 3 or 4 Activities, it shouldn't take too much effort.
Best regards,
Taka