An account owner, organization manager, the team manager of a parent team, or the team manager of the team itself can remove projects from a team.
Step 1: From the projects tab of a team, select the projects you want to remove, and then select Remove project
.
Step 2: Click on Remove button to confirm remove action
If you remove a project from parent team, then that project will still exist in all of its child teams.
If you are the team manager of a child team, you cannot remove projects from a parent team
.