Size Guide

First - go to WPBakery Page Builder > Role Manager and under the user roles, choose the post type is Custom and check the post type you want to use the WPBakery Page Builder (nasa_block)
Simply go to Static Blocks > Edit Size Guide

In addition, you can override Size Guide for Root Category Product (Parent=0)

All the products of this category will display this size guide

Size Guide for each product (High priority)

Please navigate to Products Edit Product In this Product Tab choose Additional → Additional → Choose the Size Guide table that you created in the Static Block