Hello,
I use the plugin Advanced Custom Fields.
it is possible to add a field to woocommerce in the quick fields?
ACF does not provide fields on the quick edit, so no. There is a plugin, but it may not last, that says it does this. The developers comments are
I am not quite sure if I will continue developing it. If you encounter an issue or wish for a certain feature, please do not ask me to fix it for you. I will not, but I would really appreciate when you fix it youself and send me a pull request.
https://github.com/mcguffin/acf-quick-edit-fields
I can’t say if this will do what you want or not.
There is a tutorial here on expanding the quick edit menu http://shibashake.com/wordpress-theme/expand-the-wordpress-quick-edit-menu
