Navigate to the Template section by clicking Templates in the left side menu of your Home page.

Once there, click on the Sections tab.
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Once there, click Create Template in the upper right of the page.

Next, select the source that your template will start from. To clone a dashboard template, select "Start from a template".

Next, select the dashboard template you'd like to clone. You can clone either a pre-configured template, or a custom template that you've already saved. Once you've made a selection, click "Continue".

From here, you can customize and modify the new template as you see fit via the normal dashboard template customization process.