Hello. I'm new to modding and I have a problem. I want to implement a new part for bust, but in the game it's not in the proper place as it should be like in blender and xenoviewer. Can anyone help me with that?

i.imgur.com/AEQugfB.jpg

i.imgur.com/l3JFF4g.jpg

i.imgur.com/FBOL7FP.jpg



I've been asking for help in many discord channels. Someone has told me that I should watch tutorials, but most of them are in blender 2.79 and I'm using blender 2.8. Also those tutorials didn't help me to solve the problem. In second channel I've been told it has something to do with vertex groups, however I don't know what exactly should I do.