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Answering your question - you can't create object on another layout. But you can "schedule" it using global variables. So when that another layout starts, check the global variable and create objects if needed.
For example, in the main menu player chooses game difficulty. If difficulty=Hard, then you want to create some zombies when the level starts. So you can add a global variable ZombiesToCreate=0. When player selected hard difficulty, set ZombiesToCreate=10.
On start of the Level1 layout do
Repeat ZombiesToCreate times : System create Zombie...