How to add storyboard reference in another storyboard

Question

I have 2 storyboard - mainStoryBoard1 and mainStoryBoard2.

I need to perform a segue from ViewController of mainStoryBoard1 to

Answer 1

Interface Builder in Xcode 7 has "Storyboard Reference" object in the "Object library":

Just drag that onto your storyboard. You can then select that storyboard reference and specify the storyboard to which it refers in the attributes inspector:

Then you can now add segue to this reference and you'll segue from the scene in one storyboard to a scene in another storyboard.