Big Commerce Product Data Import With Variants

I need help in bringing in product details and variants into Big Commerce. We are an apparel business and have style, color and size. One challenge is that we are offer decorating (embroidery). We have these as variants as well. However only certain customers get access to certain embroidery options. We also have a few other design issues. Looking for someone who knows the Big Commerce backend well and can help with these data loads and configurations.

Experience with Big Commerce platform is mandatory.