You can change ownership of a repository from one project to another by reassigning the repository to a different project.
To move the ownership of a repository from one project to another:
In Projects, select the relevant project or All in order for the repository to be visible.
Click Administration on the taskbar, and select Repositories. The Repositories page will open with the relevant project filter applied.
Find the repository to move and click the project name in the Project column.
To assign ownership of the resource to a different project instead, click another project name in the project list.
The resource is unassigned from the first project and ownership is moved to the second project.