The tree root is the project required by all the other projects. The tree branches represent the build paths of the projects. A project contained in a hierarchy level is automatically dependent on all the projects located higher in the branch. It is in turn required by all the projects located below.
If you used the Pacbase migration procedures and imported the instances into the location, the design path is already defined. It reflects the hierarchy of the Pacbase Libraries.
However, if you created your projects and instances from scratch, the projects of the location are all displayed at the same level. So you must specify their hierarchy manually. To do so, you must select a project and click: one of the two buttons which move the project up or down. If you move the project up, it will be nested under the project located just before in the hierarchy. If you move it down, it will be nested under the project located just after in the hierarchy.
You can add a project to the build path. If you created a project in Rational Programming for System z but have not included it in the build path yet, you can click Add to add it to the path. Select the project in the list of the available projects. If you do not add this project to the path, the links between the instances contained in this project and the instances contained in the other projects of the location cannot be resolved.
You can remove a project from the build path. To do so, select the project and click Remove. This action does not delete the project but removes it from the build path.