Hi @Andymotifs01 !
Ieva here from Matrixify.
Matrixify is able to Import your Products with Variants, but in this case we are limited to what Shopify allows. Generally the limit is 100 Variants per Product (for some stores this may differ). In this case Matrixify would be able to Import 5 Products each with 100 Variants, but not 1 Product with 500 Variants. There are some apps that have found a way around this though. I would not be able to name any as I would not know specifically which apps can do this, but I have heard that they do exist!
Also, to note, Shopify are planning to allow 2000 variants per Product and we are working on the change that will also allow that. It should be live sometime this year!
If anything or if you have any additional questions, please feel free to reach out to our support!