After you attach the domain, if you can’t use the same URL structure across all of your pages and products, you’ll need to set up 301 redirects. This tells Google that the old BigCommerce URL should forward to the new Shopify URL. This step is crucial to ensure you don’t lose any search engine rankings.
In your Shopify admin, visit Online Store > Navigation . Look for URL Redirects . This will allow you to redirect your BigCommerce URLs to the new Shopify ones. Using an app like Easy Redirects will save time if you have a large site.
Troubleshooting BigCommerce for Shopify Migration
In a perfect world, importing your store will work without a hitch. However, some users may have trouble transferring data from BigCommerce to their new online store.
Common Import Problems
Once the data transfer is complete, you'll see an import summary page with details. Here's what these messages mean and what to do to resolve the issues.
Some products, customers or orders could not be imported
If you find this happening, you can manually add what is advertising database missing. Note that if you have multiple customers with the same email address or phone number, these will not be part of the import. If two more customers have the same email or phone, you will only see the most recent customer entry.
If you had any BigCommerce products hidden when you exported all data, the products are imported into the target store as hidden. Make it available for your chosen sales channels if you want to publish the product.

Product variants could not be imported
If your product has variants and an option is missing, the product will not be imported. You will need to add the product manually.
For example, if you sell necklaces in various lengths and colors, each product needs information for both length and color. If one of the variants includes color information but not length information, the product will not be imported.
Imported products no longer have their dimensions
If you need to add product dimensions for your customers, add the information directly to the product description.