Many retailers sell products that is grouped into Matrix. A Matrix is a way of grouping inventory items that share the same basic item information but differ in one or two item characteristics, example size, colour, pattern, etc. A Matrix is a rectangular array of elements (or entries) set out by rows and columns.
For example, a shoe store can have a line of shoe that comes in different colours and sizes. Rather than adding an item for each colour and size, you add one item and define it as a Matrix. Then you can specify its characteristics like in this case colour and size. When viewing your inventory or planning a purchase or issuing an invoice, it can be very helpful to view and work with a Matrix.
A Matrix grid allows you to see on-hand quantities for each item in the Matrix (each cell represents a size/colour combination), as well as the total quantities for each colour and size, and all items combined. You can quickly spot out-of-stock items and slow moving items. Accessed from a purchase order or other document, the grid can be used to enter the quantity to order or process on the document.
You need to use Matrix in cases where the item is one with the same price across the border but differ from two characteristics; like the case of a shoe store. If you have a business where you have the same item with different characteristics and price, them you will have to add each one as a different item.