I am making some benches for a project as GDL objects, and I am trying to figure out how to make their geometry parametric. For example, there is a finger joint involved in the construction of the bench, so I'd like to be able to change the length of the finger after the object is placed, things like that. Could anybody point me in the direction of a tutorial that shows how to do this? All of the tutorials I have found until now have mostly been about the basic parameters such as materials, fills, pen types, and hotspots, but nothing about the actual geometry itself. Thanks!