You can designate any source as a parent source by simply defining a new source and identifying the desired source as its parent. So if you define SourceA and then want SourceB to be its child, assign SourceB to a thing and specify SourceA as the "Parent Source" when assigning SourceB.
Of course, the only way to define a brand new source within the Editor is to assign a thing to it. If you simply want to create a new source that has *no* things assigned to it, you need to define the source manually within a data file. For that, the syntax is defined within the Authoring Kit wiki, and the examples above will work.
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