We have migrated one of client from open sources to Shopify. You can check our portfolio here
Client SEO team was request to new website list of URL to Map with old website URL for redirection to avoid 404 error.
Client having more than 50 Blog and 35 Brand Pages
Use this tool -> https://www.xml-sitemaps.com
Rather than downloading the sitemap, go to the screen and copy-paste the list of URL in an Excel.
When you copy paste them in an xls sheet then you can easily delete the unwanted columns and will be left with only url list
