Well the title says it all. I have previously tried many things but the part I tween moves around individually without the whole model. Even after setting the part as model's primary part, it still moves alone leaving the whole model behind.
How do I Tween a Model??

4 comments
You COULD try welding all the models' parts...
It is impossible as far as I know, but what I do is get 1 part, and weld all the other parts to that one part. Then I just tween that part and the model comes along with it.
To tween the model, there are two ways, First way is to unanchor everything except 1 part being the main part that you use to position it, and use weldconstraint to weld every other part to that main part and apply the tween on that part, the other way is to make a CFrame value and tween that CFrame value and use .Changed event to set its value to the model primary part model:SetPrimaryPartCFrame
This video will probably answer your question: https://www.youtube.com/watch?v=pTxXvQM61mE