You may clone a Portal to duplicate it's contents. Everything but the name of the portal will be identical to its referent.
To clone a portal:
1) Navigate to Settings, and then select the Portals tab.
2) Locate the existing portal that you would like to clone. Click the clone portal button on the right side.
3) Give your new cloned portal a name and URL.
4) Click Clone. It may take several minutes but will continue to run in the backend.