How to Add Features in Back Office Products List

[roz]

hello!

 

i want to add the Features in one of the columns in product list at the Back Office. 

 

how can i do it?

 

and i also want to add in features in product list dropdown when you add products or creating an order at the Back Office. 

 

and lastly i also want the features to be shown in my delivery slip & invoice pdf.

 

(just in case it's just the same way how to do it  )

 

thanks!