From the dashboard click on the location in store link located in the left menu:
From this page you will be able to see a list of your stores and the pos within them. Click on the Import products link in the row against the pos you want to import products too.
On the import products page you are presented with two choices. The first is to select your import preferences and the second is to choose the file you wish to import.
This option will override any products, departments or Groups previously set up and is usually the option of choice for first time importing of products.
Option two is the same as option one in that it will override any previous departments or groups set up but will not change any set menus that have been created.
The choose file button will open a navigation window so you can navigate the files on your computer and select the document file you wish to import.