How to spawn a part parallel to another part regardless of rotation

[TheStoneBros (Lunaraid)]

can’t seem to find this anywhere, so i’ll post it here

so I am having trouble with spawning a part above another part when the original part is at an angle. I want it to look like this:

But it ends up putting the part at the correct angle, just not parallel.

I’ve tried doing this:

local orientation = player.Character:FindFirstChild("HumanoidRootPart"):FindFirstChild("AlignOrientation")
		if orientation then
			orientation:Destroy()
		end
		local part = Instance.new("Part")
		part.CanCollide = false
		part.Parent = workspace
		part.Size = Vector3.new(1,1,1)
		part.Anchored = true
		part.Name = "Midpoint of ".. CurrentPart.Name
		
		local x = math.cos(CurrentPart.Orientation.Y) * 4
		local z = math.sin(CurrentPart.Orientation.Y) * 4
		
		part.CFrame = CFrame.new(CurrentPart.Position + Vector3.new(x,4,z)) * CFrame.Angles(math.rad(CurrentPart.Orientation.X),math.rad(CurrentPart.Orientation.Y),math.rad(CurrentPart.Orientation.Z))
		--player.Character:PivotTo(CFrame.lookAt(player.Character.PrimaryPart.Position, CurrentPart.Position + Vector3.new(0,4,0)) * CFrame.Angles(math.rad(CurrentPart.Orientation.X),math.rad(CurrentPart.Orientation.Y),math.rad(CurrentPart.Orientation.Z)))
		player.Character:PivotTo(CFrame.lookAt(player.Character.PrimaryPart.Position, part.Position))

		orientation = Instance.new("AlignOrientation")
		orientation.Mode = Enum.OrientationAlignmentMode.OneAttachment
		orientation.Parent = player.Character:FindFirstChild("HumanoidRootPart")
		orientation.RigidityEnabled = true
		orientation.Attachment0 = player.Character:FindFirstChild("HumanoidRootPart"):FindFirstChild("AlignAttach")
		orientation.CFrame = player.Character:FindFirstChild("HumanoidRootPart").CFrame

I can’t seem to find a way to do this, since i keep getting errors like “CFrame Expected, got Vector3” and “Vector3 expected, got CFrame”.
I’m sure the answer is (relatively) simple, but I can’t seem to figure it out

help would be appreciated

[ComplexMetatable]

You can offset the CFrame with respect to the rotation in the following way:

workspace.Part.CFrame = workspace.Part.CFrame * CFrame.new(RIGHT_VECTOR, UP_VECTOR, LOOK_VECTOR)

Assign the components of CFrame.new according to your needs.

[TheStoneBros (Lunaraid)]

thank you very much, found out this does the trick:

workspace.Destination.CFrame = (workspace.start.CFrame * CFrame.new(0,4,0)) * CFrame.new(workspace.start.CFrame.RightVector, workspace.start.CFrame.UpVector, workspace.start.CFrame.LookVector)