Can you set up a "many to one" table; i.e. one artist has 3 paintings and each one has a title, category, dimensions and price.

Please try checking our configurable list widget: https://www.jotform.com/help/282-How-to-Set-Up-the-Configurable-List-Widget. If you wish to keep the number of rows static, you can set the maximal and minimal rows to the same value.