How do I CFrame a model? As in move a whole model at the same time?

I'm trying to make a script where when the player pressed b they can spawn a certain model. And the model starts from the air and slowly comes down. But I don't know how to move the bricks at the same time.

My current script which I know wont work:

player = game.Players.LocalPlayer
mouse = player:GetMouse()
CanUse = true
mouse.KeyDown:connect(function(key)
-- Detects if keydown is pressed
	if key == "b" then
		CanUse = false
		print ("spawning model....")
		BG = game.Lighting.BegginerBricks:clone("BG")
		BG.Parent = game.Workspace
		BG.CFrame = player.Character.Torso.CFrame * CFrame.new(0,100,0)
		for i = 100, 0, -.5 do
			BG.CFrame = player.Character.Torso.CFrame * CFrame.new(0,i,0)
			wait()
		end
	end
end)

Solved! to anybody who needs it here is my full working script.

player = game.Players.LocalPlayer
mouse = player:GetMouse()
CanUse = true
mouse.KeyDown:connect(function(key)
-- Detects if keydown is pressed
	if key == "b" then
		CanUse = false
		print ("spawning model....")
		BG = game.Lighting.BegginerBricks:clone("BG")
		BG.Parent = game.Workspace
		BG:SetPrimaryPartCFrame(player.Character.Torso.CFrame * CFrame.new(0,100,0))
		PositionWhenCalled = player.Character.Torso.CFrame
		for i = 100, 0, -.5 do
			BG:SetPrimaryPartCFrame(PositionWhenCalled*CFrame.new(0,i,0))
			wait()
		end
	end
end)