Custom breadcrumbs for custom single product page

Hi,
We are using the Enfold theme with Woocommerce quite successfully for our customized rental inventory catalogue. We decided to create a custom page with the product grid so we could use the submenu for navigation within only one category of the store.
Here is our example: https://www.azinspiredenvironments.com/rental-inventory/custom-made-decor/

There are two questions we have:

1. When a user goes to the single product page, the breadcrumb shows the default woocommerce version that then takes you back to the default category pages that don’t have our custom submenu. Example: https://www.azinspiredenvironments.com/rental-inventory/product-cat/southwestern-rug/

How do we set up the breadcrumbs for only the Custom Made & Decor section to link our custom product grid pages?

2. Since the website is showing two identical product category pages: One woo default and one with the custom product grid, that creates duplicate product pages, correct? If that is the case, what is the best way to fix this?

Our preference would be to use the default Woocomerce breadcrumbs and pages but have a horizontal menu just for the Custom Made and Decor page and sub categories for easy navigation, but we didn’t know how to do this without creating a separate page with a product grid.

Suggestions for best way to do this and not create duplicate product pages would be really appreciated.

Thanks so much!