# Conceptual Product Structure

## How to Copy a Structure Element of the Modular BOM

| ### What to do:
| To work through this example, you should use the clear modular BOM as created in the Modular BOM section.
| Select Start > Bill of Materials > Product Component - Modular. The Product Component - Modular mask is opened.
| Search for MDL-001 Pen.
| Select Modular BOM Overview from the context menu.
| The overview makes it easier to decide which structure can be moved and where to.
| In the structure of MDL-001 Pen search for MDL-008 Lower Body Complete and open its Module mask. The Module mask is opened.
| Select Copy Structure... from the context menu.
| The title of this mask informs you about the action that can be carried out.
| Select MDL-002 Upper Body Complete.
| Select Take entry from the context menu. The following message is displayed.
| Here you can decide if the nodes from the assigned parallel structure should be copied as well or not.
| Click No.
| When copying a structure element into another it has to be ensured that they do not contain the same position numbers. Otherwise, an error message is displayed in the message window and the structure element is not copied. Position <20> already exists or predecessor in wrong state!
| After the structure element was copied, the original structure element still exist.