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The process of building projects that are dependent on each other in GitLab CI involves the following steps:

1. Set up the pipeline: Define the pipeline for each project that needs to be built.

2. Define dependencies: Specify the dependencies each project has on the other. For example, if project A depends on project B, then project A's pipeline should start only after project B's pipeline is successfully completed.

3. Use stages: Use stages to define the order in which projects are built. Stages are defined in the .gitlab-ci.yml file.

4. Define jobs: Define jobs for each stage in the pipeline. Each job corresponds to a specific task, such as building or testing the code.

5. Use artifacts: Use artifacts to share files between jobs. For example, if project A depends on a library built by project B, use artifacts to pass the library files from project B's build job to project A's build job.

6. Use triggers: Use triggers to automatically start a pipeline for a dependent project when changes are made to the upstream project.

7. Use variables: Use variables to store and share information between pipelines. For example, store the version number of a library in a variable, and use it in the dependent project's pipeline.

By following these steps, you can set up a reliable CI/CD pipeline for projects that are dependent on each other in GitLab CI.