Products with custom options will be converted to products with variants in your Shopify store.
And due to Shopify variant and option limits, when a product is migrated, out-of-bounds variants will be truncated if the number of variants is greater than 100 or the number of options is more than 3. If you are facing this problem, you can use a Product Option app and contact us to customize the migration tool to your requirements.
UPDATE (for Shopify 2.0):
Since Shopify has released the new version 2.0, there are some changes to the Shopify migration:
- Custom attributes are migrated to metafields.
- Multi-language support for custom options and attributes.