How do I move a part relative to another part?

This may be easy but I can't understand the math in my head and I'm not sure how to explain it but...

What I'm trying to do is make a model-moving tool. I've created the basics of the tool but without the math needed, every part just moves to the same position in a big mess instead of keeping the original shape of the structure.

I'm wondering If anyone can help me figure out the math needed to make a model move relatively to the primary part. The parts wanting to be moved are not grouped and cannot be grouped, so I'm trying to find a way to make each part move separately to where they were relative to the primary part.

I've tried a few CFraming methods but the results are just the same, either it fails or I end up getting stuck, wondering what to do next. And, also tried to find some tools that I could study, nothing helped though. Does anyone know any methods on how I would do this?

I think i understand your question. if this answer is irrelivent tell me and i will try cand make one more relevent

So to move a model the way you want you can use the :MoveTo() command The MoveTo() command moves the models primary part to the Vector3 position inside the arguements. so if you drag the models primary part you can set its position by inserting the Mouse.p into the arguements.

so the code could look something like this

Model = (Model You want to be moved)
Mouse = (Players Mouse)

While MousePressed == true do

	if Mouse.Target.Parent == Model then

		Model.PrimaryPart = Mouse.Target
		wait(0.1)

		While MousePressed == true do

			Model:MoveTo(mouse.p)

		end

	else

		print("NotGrabbingModel")

	end

end

this might work i havent tested it yet but it should.