# Conceptual Product Structure

## How to Assign a Filter (Modular BOM)

| ### What to do:
| To work through this example, you must first complete the example Create multi-level Product Structure.
| Select Start > Bill of Material > Product Component - Modular. The Product Component - Modular mask is opened.
| Search for Pen.
| Select the Structure tab.
| Click on the Position number of the entry Upper Body Complete. The Module mask is opened.
| Select the Structure tab.
| Click on the Position number of the entry Upper Body Housing. The Module mask is opened.
| Select the Filter tab.
| To change to insert mode click .
| Click in the Name field. A selection menu is opened which contains the default attribute entries. It can also contain additional entries, depending on the attributes defined for an item.
| Select Metal.
| Enter "y" in the Value column. ("y" = YES)
| Only those items will be listed in the Variants tab which have the attribute Metal.