How do I animate a knife with the blade and handle compacted into one moving, view for more details

Okay so this is mad annoying, I used the Rig Editor plugin so I have an invisible part called “HumanRootPart” inside the model is also an animation controller the thing that annoys me is the Knife Handle and the Knife Blade is seperated, how do I put this into just a one solid model inside the animation ui.

Weld them together rather than connecting them with Motor6Ds.

Use weld constraint to weld the parts