While you can't directly duplicate a product page, you can achieve the same result by creating a custom product page template and assigning it to different products. Here's how:
Go to your Shopify admin and navigate to Online Store → Themes
Click "Customize" next to your Atlas theme
At the top of the screen in the theme editor, click the dropdown menu showing the current page
Select the product page you want to duplicate
Click "Create template"
Give your new template a name that you'll remember (e.g., "Featured Product")
Click "Create template"
After creating the template, you can:
Customize it with different sections and content
Assign specific products to use this template by:
Going to Products in your Shopify admin
Selecting the product you want to use this template
Scrolling to "Theme templates" in the product settings
Choosing your new template from the dropdown menu
Saving your changes