How to weld a bunch of models together without breaking tweens

[vivid bobcat]

I need to weld all these parts while being able to tween some of them

[vapid trout]

use a module that welds it together

most effienct way to do it

https://www.youtube.com/watch?v=zSa_youTNqM

[vivid bobcat]

Also I am tweening the orientation but I was it to tween according to the pivot offsets position but it rotates around its center