To copy a Journey from one Site to another Site:
On the Portal, open the Site containing the Journey you want to copy and select the Journeys tab.
On the table containing the list of Journeys, check the box on the row of the Journey(s) you want to copy.
Click on the Target Site drop-down list, and select the destination Site in the list.
Click on the Copy button to finish.
The selected Journey or Journeys are now copied to the selected Site along with all their content.