A hook-up drawing is made up of individually marked parts called items. These items have to be purchased. The service that a Bill of Material provides you with depends upon how completely you fill in the hook-up item library. The minimum amount of data required to provide is the item number. Entering more data is left to your discretion.
Smart Instrumentation allows you to define a large number of hook-up items and group them in item libraries and sub-libraries. You create and manage item libraries in the Reference Explorer. A new item library that you create automatically contains a default sub-library, which you can use for assigning hook-up items if you do not work with pipe specs. For more information on implementation of pipe specs in Smart Instrumentation, see Pipe Specs. When defining a new item in Smart Instrumentation, you can enter a number of hook-up item properties, such as item size, model, material, storage number, unit of measure, and so forth. Also, it is possible to define hook-up item manufacturers in the Item Manufacturers the supporting table and then assign the appropriate manufacture to the item.
You must set one item library as the active item library for your <plant>. After you create hook-up items in this library, you can use the Domain Explorer options to associate the appropriate sub-library with hook-ups, and then, associate specific items with these hook-ups. After making the associations, you can generate Hook-Up Item List reports and a Bill of Material. In the Bill of Material, you can sort the items by the item order. After associating hook-up items with a hook-up, the software generates new sequence numbers automatically and allows you to sort the items by their order of their assignment to a hook-up.
In the Reference Explorer, hook-up items are displayed in the Hook-Up Item Libraries folder, under sub-libraries. In the Domain Explorer hook-up items are displayed in the Hook-Ups folder, under hook-ups. Hook-up items are indicated with 
.