You might want to link between multiple portals. You may do so via the Menu tab in your Web Portal Settings.
- Click Create Menu Item.
- Add a Menu Item Name (i.e. "Secondary Portal").
- Select Visibility.
- Leave Calendar Page blank.
- Add the Direct Link to your second portal (you may find the link in your web portals list).
- Click Create Menu Item.
This adds a button on your portal header that links to your secondary portal.