I was wondering if it is possible to like a extruded cut to a part so as you place the part on the assembly it automatically makes a extruded cut on the component
EX. as you place a series of small pipes on a piece of sheet metal the automatically cut a hole into the piece as you place the pipes.
Check out Smart Components in the SolidWorks Help.
http://help.solidworks.com/2012/English/SolidWorks/sldworks/Smart_Components.htm
There is also a Tutorial under Help > SolidWorks Tutorials > Set 2
Cheers,
Anna