If a file in a project refers to another project, then the other project is declared as a dependent project.
On "Rebuild Project Dependencies..." window under iTest Project menu, by default "Rebuild all Projects" will be selected. If you want to perform dependency for all the projects, you can go with this option.
If you want selected projects dependency, select "Rebuild selected projects" and check the list of projects that are dependent as per your requirement.
For Example, consider following two projects with files below:
Testcase is present
Session_profile is present
Response_map is present
When there is no dependency between these two projects, we get warnings like below:
Once we make the two projects dependent on each other, we will not get any such warnings.