Usually when you import a blueprint from an organization to another, you need to re-establish the connections and only after that you can save the scenario.
Regarding the first question where you have built the scenario, and you can not save it, I have to ask you for more information and some screenshots with the message from when you try to save the scenario.
Usually, if you get errors in the scenario when you try to save it, a pop-up window appears with the reason and a button to Save anyway.