Use the _Player.MarkResearchComplete(int techID) function to do it. Use the number in the .txt file for that tech as the techID. An enum for all the techs in the default tech tree exists in the helper files (OP2Helper\EnumTechID).
ex:
Player[0].MarkResearchComplete(techCyberneticTeleoperation);
(Note that I used the class name _Player above, but I used a variable of that class type in the actual code: Player[0]. Don't confuse the two. You pretty much always want to use the later.)