Occasionally, companies stop working with other companies, it happens
Step 1 - Make a list of manufacturers who will be removed.
Step 2 - Make a list of URL’s associated with those
manufacturers. (Manufacturer pages and Product Pages)
Step 3 - Remove any static links to those URLs from the rest of
your site. (contextual links, sidebars, footers, navigation menu’s…etc.)
Step 4 - Create a 301 redirect from each old URL to a new URL to
prevent broken links and 404 page errors.
Step 5 - Test each redirect individually to be sure the old URL
goes to the new URL
Step 6 - Remove the old manufacturer’s products from your
catalog.
Step 7 - Rebuild and resubmit your sitemap to Google & Bing