MBD is based on Y14.41-2003 Digital Product Definition Data Practices that establishes standards and requirements for tolerances, dimensional data, and other digital design annotations on 3D solid models. Combination States are important in the MBD context as they facilitate the presentation of model and the related annotations.
Combination States in Creo Parametric
In Creo Parametric, you can view an assembly in different states like simplified representations, orientations, explode states, cross sections, and zone clippings. Combined views are collections of one or more of these individual states and you can set combined views in 3D or 2D views. For a detailed explanation on creating and organizing Combined Views, refer to this free tutorial on learning exchange here