[A] In the Business Intelligence (BI) module, there is a "Category-wise" break up of data in all the dashboards. If the product is not under a category, it will be shown as "Undefined".
[B] Similarly, it may also not get reflected in analyses of various other reports. Hence it is important to add a category in the inventory master for the item.
[C] In case you have not added the category earlier and wish to add it now, you can simply add the item category. To add an item category, follow the steps given in the below link:
Keywords: Add category, Inventory Master, BI Reports