What is the best way to organize resource changes in Modx Revo?

Question

MODX

Good day.
Please tell me how can I solve this problem.
There is a site on Modx Revo. It contains about 30 city contexts.
Each city has directories, sub-directories in them and the goods themselves in them. Goods are the same in all cities.
All contexts can be divided into Rostov and Moscow. Because of this, only the value of one TV-field will change in the products, and the rest of the fields will be the same.
When you need to add a new product or make a change to a product, you need to open all 30 cities and edit or add something, it takes a very long time.
How can this process be improved and accelerated? There was an idea to make TV fields in the first city with a description, composition, etc., so that in one place it would change and in other cities it would take the field from the specified parent. But how to link a product from the main city with a product from another city?
Note: The current structure with a million contexts and duplicate resources should remain, because SEO, positions, etc.

Answer 1

https://modstore.pro/packages/ecommerce/cityfields maybe this will work