Dependencies can be project links or dependent projects (parent/child).
A project link simply provides easier access to the project concerned, via links in blocks or views. It allows you to navigate from one project to another, for example: predecessor (Alpha Service 2024) to successor (Alpha Service 2025), request to project, or project to maintenance.
A dependent project (parent/child) corresponds to a program management requirement: project data is then consolidated on dashboards, and reports can be run on parent and child projects.
If you want the information to be consolidated at the dashboard and report block level, you will need to check the option. 
Parent-child consolidation on the page 
Global configuration.
Option 1: I'm working on a "parent" project, and I'd like to add children's projects to it.
- In the project area, access the theme
Setting. - Click on No access.
- Click on the Add, then Add children's projects.
- Select the project to be linked to your project, via the list or search.
- Click on Add to save changes.
Please note that a project filter may be applied. You can remove it at the top of the window.
Option 2: I am working on a "child" project, and I would like to declare a parent project to this project.
- In the project area, access the theme Setting.
- Click on No access.
- Enter the name of the project to be added as the parent project in the field Father project.
- Click on the right project.
- Click on Add to save changes.
Option 3: I'm working on a project, and I'd like to add a link to another project
- In the project area, access the theme Setting.
- Click on No access.
- Click on Add.
- Select the project to be linked to your project, via the list or search.
- Click on Add.
Delete.
