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In a graph object, there is the possibility to the see series that created the graph by using:
proc -> display graph data / make group

I wanted this to be available within a program, however I could not find it in documentation.
By trial and error, however, I have found that there exists an undocumented proc that does this:
graph01.makegroup

Could you provide some basic documentation on the options and parameters of this makegroup proc of the graph object?

makegroup as you have already discovered creates a new group object containing the series in the graph.

It can accept one optional argument which the name of the new group. For example

Thank you Jason