A cabinet cutout lets you place a cutout with a full carcass anywhere in a cabinet.
To allow access to the CabinetCutout pages you need to check the Enable Cabinet Cutout option located in Cabinet Machining > Defined Cutouts page.

Once enabled new CabinetCutout pages will be made available.
A Minute with Mike : How to use CabMasterPro pre-set cabinet cutout configurations, including easy horizontal pipe chases. [1:43 mins]
This video demonstrates the different types of the pre-set Cabinet Cutouts in CabMasterPro. [1:48mins]