Any product package that you install using IBM® Installation Manager is bundled with a version of the Eclipse IDE or workbench; this bundled workbench is the base platform for providing the functionality in the Installation Manager package. However, if you have an existing Eclipse IDE on your workstation, then you have the option to extend it, that is, add to the IDE the additional functionality provided in the product package or packages.
To extend an existing Eclipse IDE: in the Location page of the Install Packages wizard, select the Extend an existing Eclipse IDE option.
You might extend your existing Eclipse IDE, for example, because you want to gain the functionality provided in a product package, but you also want to have the preferences and settings in your current IDE when you work with the functionality from the product package. You also might want to work with plug-ins that you have installed that already extend the Eclipse IDE.