Creating 2 quarter-sheet sized booklet on single sheet of paper

I need to create/print a booklet that is 1/4 size of a sheet of 8.5" x 11" paper. From this page, How can I print a booklet from a pdf file?, I know I how to create the booklet. But this is larger than I want.

Because this is just a quarter size sheet of paper, I can print two copies of the booklet on a single sheet of paper. I need to know how to automagically make this happen; stack one on top of the other.

Is this even possible?