Maintain Inventory Item

When the company open 

click on the option maintain and open the inventory item.

When you open the inventory item than a new window will be open.

In this window enter the  item id with code like f1212, and also enter the description, item class, price level, item tax type, last unit cost, cost method etc. Now click on the custom fields than a new window will be open.

In this window we enter the Item ID, Description, Item Class, 

In this window we enter price history, units sold, sales, units