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In PSSE all network data are stored in pu.
It is possible to have one saved case combining a 50 Hz and 60 Hz system, but that saved case will only have ONE base frequency; 50 or 60 Hz. You can't assign base frequency to individual buses.
Before reading the raw data for the second system you must change the frequency at the first line in the raw data file to the frequency of the first system. Also, change the IC code to 1. Note, there is no need to recalculate any branch or transformer data.
The line capacitance in the second system will be shown wrong (in spreadsheets and reports) if transmission line input option is set to Ohms, since the capacitance is calculated with wrong base frequency. However, the pu value is correct and the load flow is correct.
That means it is just to pretend that, for example, the 60 Hz system is a 50 Hz system and add it to the 50 Hz system.
