Better overview of product data
You can define and keep track of all the product fields in your master feed in one place.
If you want to change a field, eg. title, you will change it only once in the internal fields and it will be automatically updated on all the shopping channels.
Quicker optimizations all across the board
Let’s say you sell three types of apparel products: Dresses, Shoes and Shirts. For each apparel product you want a different title format to use across all shopping channels. Moreover, you need a general title format for all products for some channels. You can create these enriched titles in the Internal Fields section and they will be updated on all channels where you use them.
Avoiding errors and mismatching
By making all updates and optimizations in one place you are sure that all data is accurate on every channel.