With it’s single modeling environment you are no longer constrained by creating parts and building assemblies from them in the way traditional CAD requires you to.
Every object in xDesign is a component which means you can create the features that define your design anywhere you like even in what is traditionally considered an assembly. At any point you decide on which features define a component and create them on the fly. This gives you unmatched flexibility in how you design, allowing you to work out new components and features without the constraints of traditional CAD.
xDesign also offers traditional assembly design with drag and drop of components into an assembly, and finding components is a simple search on the 3DEXPERIENCE Platform. Plus you can manipulate and mate the components just like SOLIDWORKS.