Tweak quantity value of linked products

Hi,

I would like to use your plugin with yith booking and appointment for woocommerce plugin. Everything is working fine except that I would like to sync the linked product quantity not with the main product quantity, but with the number of people. (custom quantity from the yith plugin)

How can I tweak you plugin to use this custom value instead?

Here are the available options I have in mind:
– Use a custom hook / filter, if any
– Set the linked product quantity using Javascript, if possible
– Adapt the logic of your plugin code, if you can hint me where I can do that

Thanks for your help,
Laurent