title: Manipulate woocommerce product edit page
body: <p>I am new to wordpress and woocommerce development and I am just wondering, how to manipulate an admin-screen in a clean, updateable way.</p>
  
  <p>For example, I want to add a custom field to a product edit page (see screen):</p>
  
  <p><a href="https://i.stack.imgur.com/Olau4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Olau4.png" alt="enter image description here"></a></p>
  
  <p>I know, that I have to write a custom extension, but is it possible, to manipulate admin-screens of other extensions? I couldn't find any suitable tutorial? Maybe someone has a hint, where to start?</p>