Option 1
To enable the "Create a Custom Dashboard based on the current Dashboard" you can create a parameterized input from the Data Tab in the right draw on the current dashboard. Once created, it will be marked as "optional" input along with fallback value and that will become available data in this dashboard page when choosing to create a dashboard based on it.
Option 2
You can copy the dashboard via the definitions tooling as per the attached screenshot.
Go to:
Configuration | Definitions | My Definitions
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