When you need to add another store, you probably want to map all products to new store manually.

This module allows you to copy all data from one store to another store by one click.

Once logged into admin go to extension > modules > Copy Store Information and select source and destination store in order to copy all products, categories, information, manufacturers from source store to destination one.

This module copies these data:
-Products
-Categories
-Information
-Manufacturers

Installation of the module will not affect any files nor it will modify any files.