To reuse a journey, follow the steps below:
From the modules menu
icon, the Journey 
icon.By the relevant journey, click the Reuse
icon.Name the journey, then select the:
Sender profile.
Start date.
End date.
Send frequency.
Optional settings: Description, control group, exclusion rule.
Click Save, then confirm if you'd like to copy configured items. These are the original campaigns and campaign relationships.
Yes: The new journey will be exactly the same as the one you've copied including all of its details and elements.
No: This will just copy the journey layout and structure. You can later or add new campaigns or change the structure.