When I tried to give a rogue more than one combat trick, Hero Lab said it wasn't legal, giving the following error message: "The Swashbuckler archetype or Rogue Combat Training is required in order to select this ability more than once."
What is "Rogue Combat Training"?
It is out of the Pathfinder Chronicles: Faction Guide
By joining a faction called the Bloodstone Swords, you can take up combat training in order to gain the possibility of taking another Combat Trick, for 20 CPA (Current Prestige Award)
CPA and TPA are sort of a home-game version of PFS prestige and fame.
Thanks!