Add a product
To add a product, use the AddNewProduct method of the IConfigurationModel object. The product is added to the end.
public void AddNewProduct(ICommandContext c, ICommandParams p)
{
    IConfigurationModel configurationModel = c.App.Workspace.CurrentProject.ProductLineModel.ConfigurationModel;
    //Add a product with the specified name
    configurationModel.AddNewProduct("ACC-0011");
}