A moveable or flexible component, such as springs, hinges, skeleton parts, or datums lock the referenced components to form one body during dragging operations. This eliminates the degrees of freedom required to move the assembly. Locked components can be excluded from the assembly for the duration of the dragging operation, enabling kinematic movement of the assembly. Regeneration of the assembly updates these components to the new position. Components can be reincluded after dragging operations.

Components excluded form mechanism operations are moved to the Excluded Components folder in the Mechanism Design Tree. This folder contains all components excluded from the assembly, suppressed components, and those specifically excluded.