How to weld a part to another part but take into account its size?

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1

So I know that the C1 and C0 have to be the inverse of the different parts, but I need to add the size of the part into account so it positions exactly how it was before it was welded

2

I don’t know what you mean, but if you want to weld a part to other and keep its cframe then do this

                               local Weld = Instance.new("Weld")
				local Offset = Part0.CFrame:ToObjectSpace(Part1.CFrame)
				Weld.Part0 = Part0
				Weld.Part1 = Part1;
				Weld.C0 = Offset
				Weld.Parent = Part0