How to add supplementary information to a Managed Product.
This article will show you how to add additional information; Descriptions/Search Keywords/META Data to managed products. Areas that are not greyed out are not managed and therefore any information you enter will not be overwritten when we run the monthly catalog update.
Descriptions

The first thing you will want to do is edit the product that you want to add content on. Under the "Descriptions" menu click on "Add new record" which is located under the Additional content section.
Next, use the wysiwyg editor to populate this screen with the information you desire. If you want the content to be displayed on the storefront, enable the "Display In Store" option. Finally, click on "check box" to save your changes.