How to manage stock only for parent products

[Council Anderson]

Hello,

I created child products in order to manage the same product with different SKU. However, i don't want use the child stock level but only the parent stock level.
I mean if a customer purchase a child product then this is the parent product which should be out of stock.
For now, this the child product which is reduce stock.

How can i do ? Thank you for your help.