To run a preset collection through command line is not currently possible but it is on our list of things to do.
You can run the individual tests from a complex test or you can run 'em all.
To run an individual test use this command argument:
-AutomationTests=“Pretty.TestName”
Example:
-AutomationTests="Blueprints.Compile Blueprints.My Awesome Blueprint, “Blueprints.Compile Blueprints.MyOKBlueprint”
To run all of a complex test then use:
-Execcmds=“Automation Run FCompileBlueprintsTest”
Does this answer your question?