Does DSM support nested symbols? Does it work with symbol overrides?

Design System Manager syncs nested symbols and overrides when you sync a component. When you upload a component, DSM automatically uploads its entire dependency tree with it. This way, you don’t have to hunt for dependencies and upload them individually.
Similarly, when you pull a component into a new document, DSM brings its entire dependency tree with it. This means you can start choosing among possible overrides as you design with the component, and don’t have to worry about pulling each dependency independently for the component to render. 
When an updated symbol syncs to the document, the previous overrides are kept in place, so you can apply a visual refresh while maintaining the component state. 

Getting Started: Design System Manager (DSM) (