Bulk Order/Multiple Variants with product customisation

[farmerdesign]

Im building a store for a garment printing business....

The problem im trying to solve:

I need to be able to create a bulk order with various garment colour options and sizes. I then need to be able ad on product customisation (so e.g Embroidered logo left chest £2) this needs to be added to each individual garment. Even simply - if they want to order 6x small beige hoodies and 4 large black variant hoodies - Id need to ad 10x ad ons of £2 and have somewhere for the customer to upload their logo.

Iv tried a few apps...and can get the bulk order part easily and the customisation part easily - its when I want the two apps to talk to one another...

Can anyone suggest how I could do this more easily? Basically I need a "bulk order app with product customisation options"

Link to the site:

https://zala-sport.myshopify.com/products/am001