orcad import isis
ISIS can churn out a netlist in :
SDF (Native Labcenter Format).
Eedesigner
Multiwire
Tango
Vutrax
Boardmaker
Futurenet
Racal
Valid
SPICE
Spice-Age
Provided Orcad can import one of the above netlist formats (Tango??) the only remaining problem is likely to be with nomenclature. For example, what ARES calls a DIL14 Orcad may call a DIL_14 or a 14DIL. In such cases you'll need to either edit the netlist, sort it in ISIS before creating the netlist or sort it at the import end in Orcad.
Iain.