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Anyone want to help me get my breadcrumb trail wroking correctly?

I have a breadcrumb trail that is maddening to figure out.

I have 4 Pages that contain subcategories so I’ve had to create them as seperate pages and not in the traditional CMS format. The four pages are:

Exterior, Living Quarters Exterior, Living Quarters interior, and Fasteners.

what I can’t figure out is how to connect those subcategories pages to their previous linked pages in the breadcrumb nav like the one here:

I also don’t know how to make the correct connection to the product page after that so that all 4 breadcrumbs go to the right spot.

Here’s my public Share link to get in there and take a look:

Any help would be totally awesome.

Thank you!