Any methods to save my new print size?

I'm a building designer and I have such a question:

I'm using the pdfcreator ( version 3.51 ), currently I have a new setting for my drawing size ( not common size );

Such as A1 1.25 plus ( 594 x 1051 )& A0 1.25 plus ( 841 x 1486 )

is there any method that I can save those two drawing size together?