Not sure I clearly understand your question, but here goes something: copying objects from the navigator in one page lets you paste the objects in another. Same between projects.
edit: from the contextual menu, you can also duplicate an object in the navigator or on the page itself.
I don’t think that you can do it consistently. I know that copying properties from a class in the navigator lets you paste the names in notepad++ for example. Same with property names of objects or names of constants. But I have not been able to do this with objects themselves.