# Allocating Change Windows to CMDB Items

Each Change Window is part of a Change Calendar that is defined when the Change Calendar is created.  The Change manager or System Administrator will [create the change calendars](https://docs.alemba.com/asm/asm-hermes/use-asm/using-asm-core/requests-and-tasks/managing-change-calendars).

**To link CMDB items to a Change Window**, use the Change Windows Explorer option on the **Request Details** window.

<figure><img src="https://content.gitbook.com/content/hlW9jKl7dcDggHAPhNU9/blobs/Z2SEAMyRXhE2CCe1KqOi/image.png" alt=""><figcaption></figcaption></figure>

1. Click **Change Windows**
2. Click **Add New**, and select the change window you would like to use.
3. Save the changes