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The normal approach should be to use standard PSSE-activities.

1. Open distribution network model and write a raw data file for the subsystem consisting of 132 kV and below. Select option "Add to working case".

2. Open transmission network model and PURG the subsystem consisting of 132 kV and below.

3. Read the raw data file from step 1 to add the detailed 132 & 66 kV system to the transmission system.

The two models are now merged. Use JOIN if the 132 kV transformers buses have different bus numbers in the transmission and distribution model.