Nicole Pan Tavares
Subscriber

I managed to do this by giving the number of lines to be selected, and thus creating the surface only in the desired region. 
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selection_curves = []  # Lista para armazenar os valores de Curves[i]

for i in range(13):  # Iterando de 0 a 13
    curve = GetRootPart().DatumPlanes[0].Curves[i]
    selection_curves.append(curve)

selection = Selection.Create(selection_curves)
secondarySelection = Selection.Empty()
options = FillOptions()
result = Fill.Execute(selection, secondarySelection, options, FillMode.Layout, None)

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