Buildbox and Construct 2 are two different beasts. And for those of us who never used Buildbox, it doesn't make sense what you are asking.
What exactly are you trying to duplicate in the end ?
Can you show a screenshot and describe precisely what you are trying to achieve ?
With those precise explanation we can tell you how to do what you are trying to do.
If you are trying to copy some events/action and replace the object type they are affecting, when you right click the event/action you have the "Replace object" that can allow you to do so if the objects are the same type/contain the same type of behaviors/instance variables.