I presume you mean the 2nd and 4th frame.
In general, it's best to use wires to move data around, in order not to disrupt the dataflow. If you keep your wiring clean, it shouldn't be a problem. If you don't want that, you have two options - you could use local variables (by right clicking on the terminal and selecting "create>>local variable"), which act like variables in other languages, but you should watch out for race conditions (writing to the same variable from two different places). The other option, if you have 7.0 and above, you can replace the flat structure with a stacked structure and right click on its edge to create a "sequence local" which allows you to transfer data between frames.
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