This is a post by Natasha Reaves on the Rand 3D site.
In Creo Parametric, the Bill of Materials (BOM) is a list of all the components needed to build the assembly. The BOM also lists the total quantity of each component included in the assembly.
To create a Bill of Materials, open or activate an assembly model, then click the (Bill of Materials) icon. This tool is in the Investigate group on both the Model tab and the Tools tab. Clicking on this tool launches the Bill of Materials (BOM) dialog box.