Whenever you close a project or end the session, you are prompted to save any changes, if necessary. Projects are saved into files with the *.tas file extension.
From the menus choose File >
Save Project. The project is saved.
When you close a project, a dialog box opens, asking
whether you want to save the changes you made to the project and whether
you want to (re)publish the libraries.

Select Save changes to project.
If you want to publish libraries for later reuse or
to update public versions, select Publish
libraries as well. If there are no libraries in need of
publishing, this option is disabled. See the topic Publishing Libraries for more information.
Click Yes to save.
If you elected to publish libraries, another dialog box opens. See the topic Sharing Libraries for more information.
If you receive an alert for a duplicate name or if you choose to save the project with a different name, the Save Project As dialog box opens.

Enter the new, unique name for the project in the File
Name text box.
Click Save to
save the new name.