Creating new product description tab and save in custom product table

[Kishore]

I tried to add new product description near existing product tab in prestashop 1.7.4.2.
I referred the previous forum questions and answers, then I added the new fields near the product description tabs. 
Previous forum answer https://www.prestashop.com/forums/topic/272602-solved-add-a-second-category-description/
Now the problem is I need the additional tab contents to be placed in separate table in database(not affecting default product_lang table).