How to add email Id field inside add new product category form?

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I need to add email id field inside add new product category form. Also I need to send an email to that specific email id when a sale it made which is set for every category. Please help me on this matter. Your help and guideline will be highly appreciated.

[NemoPS]

It's very difficult to guide you through the whole development.
You need to

1- extend the category object to add a field that holds the email: http://nemops.com/extending-prestashop-objects/#.VjnSO7fnvmg
2- extend/hook something to the admincategoriescontroller, to add the field visually

3- add a hook with a module, hookActionValidateOrder, and from it trigger the email

[[email protected]]

Thanks Nemo1 for your guidence. Appreciated!