One application consisting of many sub applications. How to connect reusable components.

[breaddes]

I trying to get my head around the planning for an angular2 application. It should be one application that consists of many extendable sub-applications. All sub applications share services, templates and methods but also alter them for specific purposes. 

So here's the basic functionality that is needed:

1. A shared application entry point where it is decided which sub application to load. This is usually identified by the second url param. 

2. Components that have shared functionality that all sub applications need, but also to be able to extend or override functions with custom and specific code.

It would be great if anyone can come up with a good system to work on that?