Multiple PO output layout

Hello,

I have a working SAP MM system. Purchase orders are printed using sapscript.

I have a new requirement for an additional PO layout. So, the PO processing will be done in the same plant, company code, etc, but the layout should be different for some materials. I need your advices regarding how to differentiate these materials (I have low MM customising knoledge).

Should I define a new purchasing organisation, new message type, new order type...etc. ?

Can you describe me step by step what should I do to configure this new layout? The creation of new sapscript is not a problem.

Thanks