The Custom option is available on the Choose an installation option page in Microsoft Dynamics NAV 2013 R2 Setup.
The Custom option offers the full list of Microsoft Dynamics NAV components from which you can select individual components to install. In this way, it differs from the other installation options that are available on the Choose an installation option page, which are subsets of available components for a particular type of user or configuration. For more information, see How to: Choose Components to Install. You can use this list to design your own installation option.
Microsoft Dynamics NAV Windows client
Microsoft Dynamics NAV Server Administration tool
Microsoft Dynamics NAV Server
SQL Server Database Components
Microsoft SQL Server
Microsoft Office Outlook Add-in
Adds a toolbar to Microsoft Outlook to enable synchronization of contacts, appointments, and tasks.
Automated Data Capture System
Enables the tracking of movements within a warehouse.
Web Server Components
Enables web clients to connect to a web browser.
Installs a website that hosts the Microsoft Dynamics NAV Help content.
ClickOnce Installer Tools
Installs tools to facilitate with ClickOnce deployments.