The tool is very easy to setup and use. If your company sells items that need to be tracked separately for inventory purposes, but are substitutes for each other, this enhancement is the key. For example, if a customer orders a 12 volt Eveready battery which is out of stock, the current ACCPAC program will beep and warn you that the balance is zero. With this tool if there is a substitute item, the computer will beep (if you want it to) and ask if you would like to substitute. If you want a substitute, the program will quickly review the substitutes available and list those that have a positive balance. You can then select the appropriate item and continue with the sale.