Bulk product import, bulk product upload, CSV upload, CVS import is native functionality provided by Prestashop. However, its not as easy as it seems.
When your product count (number of SKUs, number of products) is more than 1000, manual uploading of each product is tedious and time consuming. So, if you are ready with your site but have stuck at product uploading, hire us. Provide us product data in any format you have. We will align it in the way Presta needs and will (bulk) upload it with CSV bulk import of Prestashop.
We are available by email at firstname.lastname@example.org