Creating network equivalence in PSSE

Good morning

Does anyone have any experience with creating a network equivalence for a zone (say the DUK, or TVA zone) starting from the RTEP model in PSSE?

I have been trying to do this but my PSSe will crash if using the GUI or I get a message about needing to grow the matrix if using the API

Any help ?

Have you already reviewed all the procedures in Chapter 12 of the POM, including running the example on savnw.sav case?