Apple WebObjects 3.5 Tools And Techniques - Manual (Page 19)

The Structure of a WebObjects Application Project
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To add an existing subproject (such as ClientSideJava or CommonJava) to
your project:
1. Double-click Subprojects in the first column of the browser.
2. In the Add Subprojects panel, navigate to the directory of the
subproject you want to add and click Open.
3. Double-click PB.project to add the subproject to your project.
Supporting Files
The Supporting Files suitcase contains your project’s makefile (which you
should not edit), as well as
Makefile.preamble and Makefile.postamble , which you can
modify in order to customize the makefile. You can add other files your
project may need (such as Read Me documents) to this suitcase so that they
can be edited in Project Builder.
Frameworks
A framework is a collection of classes and resources that an application can
use. By storing items such as components and images in frameworks, you
can reuse them in multiple projects without having to create multiple
copies.