Streamline changes with base components in Figma
A base component is a structural element that can help streamline changes to other components. A base component always syncs with its children's instances and saves your day from spending lots of time iterating, testing, and tweaking your designs.
To start using the base, you need to:
Create a component (A) and nest it into another component (B);
Duplicate component (B) to create alternative variants or different types/states (C, D, E, etc.);
Manipulate component (A) to propagate changes to all included variants.