Currently, there's no way to clone an existing App (i.e. Field Resource Hub). When creating a new App, it is possible to link to an existing Site Map but it doesn't completely copy the configuration. It adds the entities mentioned in the Site Map to the App but not the Form, View, Chart, and Dashboard details.
A "Save As" button which allows the user to clone the existing App and allow user to provide a name would speed up the App creation process.
If this "Save As" function can also create a new Site Map record and allow user to provide a name, that would be useful as well.