childSourceSettings property
A collection of SnapSourceSettings objects representing the child snap sources of SnapSourceSettings.source, when the snap source is a SubtypeFeatureLayer.
When this snap source is a SubtypeFeatureLayer, this collection contains a SnapSourceSettings object corresponding to each SubtypeSublayer of that layer, in the same order as the SubtypeFeatureLayer.subtypeSublayers collection.
This collection is empty when the SnapSourceSettings.source is not a SubtypeFeatureLayer.