local OnButton = script.Parent; --Wherever your actual button is
local partWithForce = game.Workspace.biglift.up;
OnButton.ClickDetector.MouseClick:connect(function()
local force = Vector3.new(0,210000,0); --Replace with your force
partWithForce.BodyForce.force = force--This will turn the force back on
end)
as soon as I model it with something else it doesn't work or if there is two of the scripts in one workspace it work work either I need multiple

2 comments
You're referencing biglift.up through the workspace, when it should look like this: local partWithForce = game.workspace.Model.biglift.up, where Model is the desired model.
still doesnt work ive already tried that