Wholesale website, product combinations table in product page, to add different sets of products in one page

Does anyone know a way (or any existing extension) to implement the following?

I'm making a wholesale website, one requirement is let the users be able to add multiple combinations of products in product page.
Take tshirt as an example, for one model it can have multiple colors and different sizes, the user should be able to choose the quantity he/she wants for each combination of color and size. Something like in the following screenshot:


I found this extension https://www.opencart.com/index.php?rout ... lor%20size, which meets my requirement, the only problem is that it has limitation of 8 columns and rows (I talked with the developer of this extension, he said that opencart has this limitation, so it's not possible to make more) and the configuration of the table in admin side is very complex and messy (have to setup every single combination). I need more columns and rows, because some of the products has more options.

I'm stuck in this for a long time, please anyone help. Thanks a lot!

We've built this sort of thing before, so you might want to get in touch, or you might want to ask for other developers on the Commercial Support forum.