hi

is there a way for using spice model files in shematics-entry based free spice ?

for example if i have a spice model of a special subcircuit, how can i add it ito a schematics? (in a free schematics based spice, like SwitcherCad, or Tina-Ti) in the schematics, i want to connect them together with some other components, like transmission lines, voltage or current sources...
should i create a symbol, then add the spice model file? how? please describe step-by-step how to do it in switchercad, or other software. where to click, which menu to chose...

(just for your information: i want to simulate spice models, converted from IBIS models, and other signal/power intgegrity related sources. and i dont want to manually write a spice code to use in a command line free spice, but i want to use schematics entry.)