# Conceptual Product Structure

## How to Assign Modules to the Parallel Structure

| ### What to do:
| To work through this example, you must first complete the example Create a multi-level Parallel Structure.
| Select Start > Bill of Materials > Product Component - Modular. The Product Componen modular mask is opened.
| Search for MDL-001 Pen.
| Select the Parallel Structures tab.
| Open the link in the Node Number field of the Maintenance view. The Parallel Structure mask is opened.
| Select the Structure tab.
| Select Replaceabel Parts.
| Click . The Parallel Structure Node mask is opened.
| Select the Structure tab.
| Select Ornamental Ring.
| Click . The Parallel Structure Node mask is opened.
| Select the Module tab.
| Click the Modular BOM button. The Modular BOM Overview mask is opened.
| Select the Lower Body Ornamental Ring module.
| Drag and drop the selected module onto the Parallel Structure Node mask.
| The module and its item/s are assigned.