# Change Management

## How to Create a new Item Structure Relation (BOM) referencing a Set

| ### What to do:
| In order to work through this example you must have created a new work request EWR-2000 for the creation of a new BOM and must have created the items displayed below.
| When creating the items displayed above it is sufficient to reference the work request / work order EWR-2000 for each of them.
| Search for the item ART-1000 EP Ballpen.
| Select the BOM tab.
| To change to insert mode click .
| In the Type field click and select the type Item.
| In the Item Number field click . The Items list is opened.
| Select the item ART-1100 Lower Part.
| To save the entry click .
| Repeat the steps 3 to 7 to add the other items to the BOM.
| A new BOM with multiple item structure relations has been created.
| Please note that the items within the BoM are preliminary items. As long as the items are "preliminary" and in the state 110 | In Work, they can be modified without the use of a change operation!