I have created the free tool.
It will duplicate the menus within same store with one click.
No frustration to create again whole menu one by one.
Free Tool to duplicate the menus: https://ecomwonk.com/shopify-menus-app/
Video guide to use the tool: https://youtu.be/8SiaKHr0CKY?si=mQV-IfNvuBUxv1uP