remove parent SKU from variation SKU

I have just installed the plugin, and it works perfectly how I need it.

Best for my needs could be if you could let me know how to make the plugin not show the parent SKU when generating from attributes.

This is how the SKU far each variations are displayed: TEST-red-40

TEST is the product SKU that has been set inside the Inventory tab while editing the product.

How can I make the plugin, diplay only the red-40 without the TEST SKU ?

Maybe I could make a checkbox where I could activate/deactivate the usage of the parent SKU to some of the products ?

Thank you for your help