the datasheet give little information, how shuld i specify this on
pcb footprint on orcad program (part properties)
and what is the footprint code?
That's plain old 0.1" pin header, same as any other 0.1" pin header
(also, get pin header on ebay, not from digikey - it's more than an order of magnitude cheaper on ebay - that price is insane. I pay $1-2 for ten pieces of header 40 pins long, including shipping on ebay)
I'm not familiar with orcad, so I can't tell you what "footprint code" whatever that is - but it's just plain old pin header, there has got to be the outlines for that available.
There's a link to the drawing if you want the footprint / hole sizes.
I make pads with 0.043" radius inner diameter circle for 0.025" square posts to mount in.