When you want to use a component with Power Features in an assembly, for example to insert a bolt into a block, you must designate the components as either the source or target.
A source component is the component that has a Power Feature solid registered in its component definition, for example a bolt component with an associated Power Feature solid, that defines a hole feature the bolt fits into. The source component applies these Power Features into any intersecting target components.
For example, the bolt components 
on the model below are source components. The target component 
has intersections with the source components.
When a target component intersects with a source component, some types of Power Features are copied to the target component.
Features that can be copied include holes, Booleans, cuts, bosses and pockets. The name of a copied feature is based on the original name. For example:
Power Feature name - HASCO Z41 fit hole Name of copied feature - HASCO Z41 fit hole_1
Features that cannot be copied directly include fillets, chamfers and hollows. However, these features can be copied if they are applied to a feature that can be copied, such as a Boolean.