I need to print A3 and A1. So do I create A3 and set it to A1 and print it?

[LeeJaeYoung]

I need to print A3 and A1.
So do I create A3 and set it to A1 and print it?
Or do I create A1 and print it to A3?

I would like to know how to use it generally.

[Miha Nahtigal]

Create both A3 and A1 and print them as they are.

[Lee Hankins · Accepted solution]

Most of our layouts are A1 and are set as that for the default page size. We do this because it assists with scaling as A3 is 50% of A1. 

[vistasp]

I would create publisher sets based on page size, publish as PDF, and then print each PDF separately. That way, I only have to change paper size once when printing.