Digital BW, The Print

In order to conserve paper, especially if you're using a premium 
priced product like Photo Rag, how can I best do "test strips" in PS ?

For those who did not work in a conventional darkroom, test strips 
are multiple exposure strips made on a single sheet of paper(to 
compare subtle increments of exposure & save wasting entire sheets.

Obviously the issue isn't exposure here but I thought there must be a 
way of applying various differences, perhaps on separate layers, and 
having them side by side on a sheet? Or, perhaps there is a way of 
utilizing off cuts from larger sheets, & printing a portion of the 
image.

Anyway, if you're working in some such way, I'd be interested in 
hearing your method/s
thanks
Frankg