When you do similar work for clients you don't want to manually create the same project for every single client. To save time you can easily create a project and then copy it to all the other clients.
In order to copy a project to other clients you will need to go into the project > select "actions" > and then select "duplicate", as seen below:
Then you will select the clients that you want to copy the project for. You can either choose individual clients or choose a client group.
This feature can be particularly useful when you want to clone a project to the same client, or a different client. Once you duplicate the project, you will be able to go into the project and add the necessary customizations and edits.