If you want to use the same panoramas into different tours, that can be easily done with the following steps :
1) Select the "Panos" option from the Tour Thumbnail of the Tour you want to copy panoramas from.
2) Select the panoramas you wish to add to the new tour
3) Add them to the tour if it exists if not make sure you create a new brand tour before you start this process.
Here is a short video on how to do this