You would have to copy the project and set a new target in which to model. If you click on the folder of the top right of the screen you should see the text "manage projects". If you click on that it will take you to a project list.
If you click on the 'Hamburger" icon at the right hand side of a project (see image below), then you can copy it into your project list. From there you can set a new target and optimization metric.