Dear sir,
Greetings.
I am experienced with WordPress based eCommerce plugin WooCommerce for inserting products including variants like, size, color or any other custom attributes. Also, i could use the .csv data feed template which could import data fast. You may check the site which is WooCommerce based and i worked, buddyrentsseattle[dot]wsoa[dot]biz
Let me know if you are interested.
Thank you.
Sincerely,
ahmsuza