Chris,Originally posted in cdnusers.org by Donald Telian
Are you going to target the simulation to Tlsim or Hspice. If Hspice, just put it in a black box and you're done.
If Tlsim, the tool actually does have and handle freq dependent L. Set a CutOff Freq in Preferences, put in a geometric t-line model, run a sim, and then take a look at ntl_rlgc.inc to see the format. Then imitate that with you're Hspice data.
One of the old uProc Kits had an excel spreadsheet that would expand the Hspice-style RLGC into the tabular Espice, but I'm not sure where to find it these days. But it's not too hard to do the conversion.
Hope that helps,