Ensuring that flexibility comes first, Redmine's projects are flexible in the sense of modules. So, modules that are going to be used in a project can be chosen on a per-project basis.
Modules are chosen immediately at the formation of a new project or later in the Project Settings tab. Please keep in mind that your users will see modules only if their roles are granted permission. To create a new project and choose modules for it, perform the following steps:
Click the Projects link at top left of the screen in the main Redmine menu.
After this, click New project, and you will get a screen that looks like the following:
Just below the required project details section is a Modules section with checkboxes and module names. To turn the module on and off, just tick or untick the checkbox.