To add or remove product associated with a class, follow these steps:
1. In the Classes Overview screen, click the Manage Classes spanner icon.
2. You are now in the Class Detail screen for that class. Click the spanner icon to open the Manage Products
3. Use the blue drop down arrow to expand any product listed, then select the grey icon next to any title to associate it with the class. It will turn green once selected. Click the red cross icon to remove a title from a class. Select Save when complete. You can associate as many titles as you like with a single class.