The Bill Of Materials is established and maintained in WYS Enterprise Solutions through the use of assembly items. Using this approach ensures consistency for the user as they create and edit all of the information that is required to effectively manage multi-level BOM structures with minimal effort. Advanced options are available such as the ability to mark items as phantoms, define the expected yield, maintain revisions and/or set effectivity and expiration dates to ensure you always build the right version of your product.