Is this even possible?
like game.Workspace.Item.Move = game.StarterGui?
This is possible by setting the Parent property of an Object to the specified location.
When you Parent
something, it's holder becomes what you set it's parent to. The object is stored in that location.
So, using your example;
workspace.Item.Move.Parent = game.StarterGui
Use
game.Workspace.Item.Parent = game.StarterGui