In this example, you're given a drawing of a plate with a large slotted hole and several smaller boltholes. Your goal is to generate variations of this plate in which the slotted hole has different sizes and configurations. Each variation should be generated by simply changing the dimensions for the radius of the hole and the width and depth of the slots.

To accomplish this task, you'll assign several Symm Line constraints, which help to maintain the configuration of hole as it changes size. You'll also use parameters to control how the variation is generated.

As you work through this example, pay particular attention to the way in which symmetry lines are used by Parametric Design, and how mirror constraints are generated. You should come away from this example with a clear idea of how mirroring works.