dota 2 reborn particle

hey guys, i am currently working on a dota 2 character skin. my team and me are almost done ... but there is one problem we cannot solve. we have created a custome particle for a weapon ... but dont know how to preview it with our full set in the game engine.

is there a way to maybe overwrite the current ingame particle ? or is it not possible to submit custome particles at all ?

sorry for my bad english. i hope you guys understand my question ^^

thanks for your replies.