I believe you're asking about the psycast ability, 'Force Throw', which is within the Telekinesis tree under the Force Powers tab in the Pyscasts menu. Force Throw is unlocked by gaining psycast levels (through various means) and spending them to unlock that tree and ability.
Deflection, as far as I understand, is a passive inherent when you equip a lightsaber. The 'Throw lightsaber' ability also appears when you have a lightsaber equipped, and is a cast-able skill with a slight cooldown.

Hope this is helpful. And agreed - I love these Star Wars mods too!

I want to know when they will make the vanilla expanded skill compatible with this mod, I want to improve the deflection expertise

Delfection is Melee Skill * psychic sensitivity

Hey, just a heads up — I noticed that Star Wars: The Force – Lightsaber doesn’t seem to play well with the current Star Wars Force mod. Deflection and Force abilities don’t sync correctly. I swapped to Fully Functional Lightsabers and that fixed it. Just thought I’d share in case you want to update compatibility or add a note for players.

Thats not my mod, so i have no control over it.

Right — what I’m trying to say is that the name of this mod is really close to the [Fully Functional Lightsabers] fork for the original Star Wars – The Force mod. But the content and mechanics are very different. That makes it a little confusing for players trying to figure out which mod works with the Force mod, or which one gives the deflection mechanics they’re expecting. You might want to clarify the title or description so players know the differences right away — or maybe consider a different name to reduce confusion.

@Todokoro - My mods are all linked together. I don't support jecs lightsaber mod or his force mod , so there will always be a distinction there

I only brought it up because the names and aesthetics between the mod I mentioned and your mod can look very similar at first glance, which made it a little confusing to figure out compatibility.

I acknowledge your clarification, but I don't think anybody is really going to find out unless they dive deep into the forums to see this conversation to find out why its not compatible.

It's clear that a lot of effort has gone into making your mod, but I was only offering a suggestion.