Rebuild the catalog on Drupal 6 into an online store.

Hello, could you please help me? I have a product catalog website on Drupal 6, but due to recent changes, I would like to add the ability to add items to a cart for each product, as well as the option for payment through payment systems on the site. Is there any way to do this? If I install Ubercart, is it possible to convert the existing catalog into a fully functional online store based on Ubercart? Thank you in advance!