Import goods with summation of quantity - how to do it?

Question

WordPress

Gentlemen, tell me plz:
I'm making a store on Woocommerce, the client keeps track of the arrival of goods - that is, import incoming invoices.
The problem is that all the import plugins I've tried completely overwrite the product data - including the quantity. And how can you make sure that when the SKU matches, the quantity in the warehouse and in the imported file is summed up? Ready-made solutions are welcome, or at least tell me where to dig.

Answer 1

There is a famous plugin - www.wpallimport.com
When you set up the import process, there is a "Function editor" section in the "Edit Import" section.
Thus, you will have a full import plugin (there is an extension for woocoomerce) - www.wpallimport.com/woocommerce-product-import
+ In the "Function editor" section, you can write any php function in which you can take into account receipts. Further, your imagination is only, either to summarize, or to generate files, and so on. Your coding soul can feel at ease :)