Is it possible to add a property to all existing products in Bitrix through the admin panel?

Question

1C-Bitrix

The point of this is to set a property that will not be used anywhere except in the NM upload. Actually a text value.
Also, so that this property is added automatically to new products.

Answer 1

1. Create an add. property
2. The script runs through all the products and assigns the desired value, or open all the products one by one and just save.
(For new products, the property will be added automatically.)