Price variants can be managed via the PIM API or the Crystallize App. To do so, you'll first need the requisite permissions for Price Variants (read, create, etc). Refer to our documentation on roles and permissions for more information.
Within the Crystallize App, click the Settings button on the left-hand side of the screen, then click the Price Variants label. Click the Add variant + button. Enter the name, identifier, and currency input for the price variant. The identifier for each price variant must be unique. Finally, click Create variant.