Hey there, I never really understood welds or constraints too much. Right now I have a car, which is on a chassis I made myself. When I unanchor the body, everything falls through the ground, but if I anchor it then it doesn’t move with the rest of the chassis. I know that there is a way I could use welds to fix this, I just don’t know it. The below image is how it is organized, and everything in the body group is the body.
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All I know is that welds can be use to have something unanchored but still stick to something.
Select the weld and in properties, go to the thing that says Part0, click the bigger part it’s attached to, and on Part1, click on the part.
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Yeah, just my issue is that the welds are moving the position of certain objects 
Oh, I don’t know how to fix that, sorry. 
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Welds can be used on attaching a part, to use it you should insert a Weld inside the connected part to another, while there is weld now, you should try and modified it.