I need to be able to supply a photo of part of a large print -mainly A2. Larger prints will be produced by a commercial company. I suppose I need to set the printer page size to A2 and then view it on my display 20inch. Then I use the marquee tool to create a sample of the image? But how do I display an actual A2 size on PS?
EDIT: To clarify. This is my situation.
I am an artist. To market my prints clients either buy A3 or smaller prints. I use my own printer up to A3, for larger than A3 I use a commercial printer. Clients who may want to buy large prints need to see what a large print is like. So I want to send them a sample print which will be a selection made from the print.
What I need to do is create a sample print which will be part of the print they are thinking of purchasing. The sample print will be exactly the same as a part of the A2 print - not just a zoomed in selection.