Customization tab helps to set additional fields for text content and image assignment. For example, if you sell sets of tableware and need customers to have an opportunity to add information or illustrations before purchasing. This makes possible to modify products at your store by adding extra details on products you are offering and thereby complementing your store products' base with new properties and features.
You can find "Customization" sector on a Product page's lower menu of Store Manager:
To activate customization specify in "File fields" and "Text fields" boxes required values and press [Update Settings]:
You can specify as many customized fields as you want.
You can also select some fields (see an illustration above) and during ordering customer(s) would not be able to add certain product to the cart without filling these extra fields because they become mandatory on the front end:
There is also "Product Customization Generator", which can be used to a group of products. This option becomes available if you select two or more products from a list in the lower grid of Product(s) page:
Also you can find it on the top toolbar of Store Manager:
In the "Product Customization Fields Generator" you have to indicate what extra fields you want for these items.
Please note, positions on the front end will be the same for all products you have chosen.
Take into account the checkbox "Only add new" in the "Product Customization Fields Generator" form. It allows to create new extra fields and add them to fields that were linked before, without deleting the last ones.
Do not forget to press [Save Labels] to save your actions:
Check the following article to get more information on customized fields for multiple products creation in Store Manager for Prestashop: