thank you very much for your reply!

I know all of these that you have mention !

I dont want to be as tabs I would like full width, I have my tabs in half width next to product image .

I would like all the products to have an html block that I will choose in the position of the Extra content
exactly after the product description.

So, maybe I can make it with a function or to add the html code in one php file but I do not know which and where it is. to add my code in the position of extra content ! So I need your help !

I have already migrated all the products of an old woocomerce installation so I can not use product template.

thank you in advanced.