If you are using SilkStart's multi-chapter platform, each of your chapter sites will have its own directory to showcase members of that chapter. In addition, all members of any chapter will display in the main directory at the apex-level (parent level) of your organization, acting as a comprehensive list.
For example, let's say your chapters are called Chapter 1 and Chapter 2. Chapter 1's directory is accessed through mysite-chapter-1.com/directory, and shows all members of Chapter 1 (configurations permitting). Similarily, mysite-chapter-2.com/directory will show all members of Chapter 2.
At the parent level, mysite.com/directory will show all members of Chapter 1, Chapter 2, and any other chapters.
Each of these different directories can be configured with different search widgets and privacy settings, based on the chapter (or parent). See this article to learn more about directory options.