By default, when a drawing or peg is added to the scene, no function curve is created. You will generally create the ones needed to avoid having an overload of useless functions.
When you select an element in the Camera view and move it around, it will automatically create the corresponding function curves.
If you need to create certain functions manually, you can always do it through the Layer Properties view or editor.
You can also link a layer's parameter to an existing function curve.
|•||Creating Function Curves|
|•||Function Drop-down Menu|