You can upload your products straight to your form by creating a Products Field question and importing a CSV file that contains your products and their details.
To do this, click on the configure icon on the right-hand side of your Products question. This will open your configuration settings, next simply click the "Products" tab, from here you will see in the top-left corner the option to export and import.
Click on the "Import" button and choose the file you want.
Gotchas
The set-up of your CSV file must match ours - Click on the "Export" button and download a CSV file to use as a template.