Сould you please tell me how to create a new widget, for example, to use it in different places, or how to make a duplicate of an existing one and use it in different categories?
Here’s how you can create a new widget by following this guide:
How to create a custom WordPress widget.
For using a widget in specific categories, you can use the WOODMART WooCommerce Layered Nav Widget. It has an option called “Show on Category” where you can choose the category, and the filter will appear on that specific category page. https://snipboard.io/cKGYJa.jpg
Could you please elaborate on your concern more with some useful Screenshots so that we can better understand and assist you accordingly, what you actually want.