Each product must belong to at least one category. In such cases, the category that a product belongs to is called its 'parent'. To select a category, enter the name (or part of the name) in the single line text box of the 'category parent' section. A list of matching categories will spring up. Select the appropriate one and hit the 'Add' link next to the box. The category will be added in the box above.

Kartris supports multiple category parents. You can use the same process to add further categories. All the categories that a product belongs to will be listed in the multiple dropdown.

To remove a category from being a parent of this product, simply highlight it in the multiple dropdown list and click the 'Remove selected' link.

These product-category relationships will only be saved when the product is updated/created with the 'Save' button.

There are three selectable types of product – single version, multiple version and options product. These are explained further in @4.1.4. Product types.

When you select the product type, some of the dropdown menus immediately below will be enabled or preset to certain values and disabled. This is because certain selections of these only apply to certain product types.
If you are editing an existing product, and find that you are not permitted to change the product type, it is most likely because the product has associated data which is incompatible with the other product types. For example, if you have a multiple-version product, it cannot be changed to a single version or options products without first deleting the extraneous versions.