I'ts prefered to use a composite network and inside on it put the mcc with your 50 loads. the study is better, you can simplify it with lumped load, but ......
for example you can resume a big concentration of loads in a power system, for example in a distribution power system using a lumped load, ie: a factory or a building, and not model it pice by pice, but calculations are more exact with the particular modelation.
for your study of the mcc you must model it, and do a motor start study, to know the voltage drop on the mcc busbar and feeder. for that you must specify every motor starting method configuration and motor.
I recomend you to see this video tutorial on etap, is basic, but very userful.
use the play list link
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