We'll want to start off with the same folder and file structure before you add your own customisations.
Copy each of the following folders:
~/wwwroot/css/uskinned ~/wwwroot/images/uSkinned ~/wwwroot/scripts/uSkinned ~/wwwroot/EmailTemplates/uSkinned ~/Views/Partials/uSkinned
Now rename the copies to the name you wish to use for your codebase, in our example, we'll call it Website:
~/wwwroot/css/website ~/wwwroot/images/website ~/wwwroot/scripts/website ~/wwwroot/EmailTemplates/Website ~/Views/Partials/Website
Now we need to add our new codebase reference to the app settings. Go to the following file:
Next to "SourceCodeOptions" add your new codebase name after the uSkinned codebase:
Now restart your website.
Login to the CMS.
In the tree menu, go to 'Design'.
On the right-hand side, go to any theme design or create a new theme design.
On your chosen design, go to the 'Advanced' tab.
Under 'Frontend source', choose your new codebase from the dropdown select box.
Click 'Save and publish'. Your theme design is now using your own codebase, you can start adding your customisations.