CA question

[Sol]

As stated before, this is the overall measurement of your character’s fighting strength. It’s a measuring stick that helps determine the stronger warrior when two or more are compared together, as well as it governs just how powerful you really are. Each character starts off with a CA of 500. Combat Ability is comprised of the XP you have pumped into it, and any items you’ve equipped with CA-increasing effects. Items only offer benefits so long as they are equipped to one of your Head, Body, or Accessory slots. In order to permanently increase your Combat Ability, you must spend XP for it. Your Combat Ability may also be multiplied through the earned use of Power Ups, although this is just temporary, lasting only as long as you are in a transformed state.

Does this mean you can directly deposit XP into your CA? If so is a direct deposit into your CA more effective at raising it than the increase you'd receive from buying a tech?