Nebula Omega currently supports Shopify, Supreme, and Yeezysupply. If the site doesn't fit into any of the above, Nebula Omega will not support it. However, if the site is Shopify, you can add it as a custom Shopify. You can do this by inputting the store url in the
store box and then clicking enter.
For a more detailed guide, checkout http://docs.nebulabots.com/en/articles/3887956-custom-shopify-websites.