You can simply upload your products straight to your form through creating a 'Products' type question and importing an excel/csv format file that contains your products and their details.
To do this, click on 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.
Here you can simply click on the import and choose the file you want.
NOTE. The set-up of your file must match our system, for a template simply click on the export and download a csv/excel file to use as a template.
Happy form making!