Transferring tours is a useful function of the VR Editor.
This is how you can transfer a tour to another existing iStaging account:
Log in to the VR Editor: https://vreditor.istaging.com/
Click on the tour you would like to transfer.
Click on the button "Transfer" in the top right corner of the screen, as shown below.
Type the email of the account.
The tour will be transferred to the new account immediately.
Tip: By using the Transfer button, the URL of the tour will not change. If you use the "Copy" button, the copied tour will have a new link.