Configuring Sites (OBS)
A site is a physical or virtual office or location that can be used for scoping and to track, in detail, how much time and expenses were spent at a given location. Using sites, you can determine what site, clients, projects, tasks, users, groups and teams a particular user can view and access. In addition to its security advantages, this powerful scoping concept can be used to significantly reduce the number of projects and tasks users have to work with on day-to-day basis in a geographically dispersed organization.

Configure System
Setup System-wide preferences, Security, User Defined Fields and Automation.

Configure Sites
Setup Currency, Holiday and Regional Settings.

Configure Business Units*
Setup Business Units and associate with Projects/Users

Configure Resource Types
Create a Resource Type and setup Overtime Policy as well as Leave Time.

Configure Groups
Setup Work Types, Leave Time, Business Unit Association and Approvers. Manage Members.

Configure Teams*
Setup Teams and Team Members.

Configure Titles*

Configure Roles*
Role Definition, Members and Forecast Rates.

Configure Users
Setup Users. Site and Group Association, Contact, Login Information & Security Profile, Holiday Set, Resource Type Association and Cost & Billing Rules.
The article listed here will help guide you through the process of configuring Sites within the application: