copy paste orcad layout
I don't know about Orcad, but in Cadstar I can copy & paste, although it will only allow 1 board outline, so I have to copy the bard outline & make a figure instead for extra copies.
It does have some drawbacks, like auto incrementing component names, but if your only after the copper then it's not a problem.
Normally though I would create Gerber files & use a gerber editing program to copy/paste into a panel for multiple copies of the same board.
Etching them at home, if you make a big panel you can often lsoe more than doing them indiviually.