Hi,
See the solution provided here with detailed explanation and steps:  https://www.odoo.com/forum/help-1/how-to-duplicate-a-website-247757

Thanks

Hi,

You cannot copy a website. You need to create another one.

After that, go to the Site menu in the Website and choose Pages.

Select the pages you want to copy from existing pages and export.

Ensure to enable the field View Architecture.

Then go to the favourites menu and select import records and choose the excel that you just imported.

Change the website id to the external id of the newly created website.

Hope it Helps