How do I create

How do I create an object that does not exist in the layout ?

I think the prefab that are also in Unity .

In my project , there are objects which do not need to exist for as long as it does not bring them up .

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And how can you do a layout was inactive ?

Only the layout is drawn exactly what I use .

You can try putting Destroy Outside Layout behavior for all the objects and simply have them start outside the layout on start. That way they will be immediately destroyed when you run the layout.

Not sure what you're asking in the second part though?

System > Create object allows you to create arbitrary objects.