You can remove attachments from a custom baseline.

To delete an attachment from a custom baseline

  1. In the Baselines Library, under Custom Baselines, click the name of the customized baseline node to expand it, and then click Attachments \ Guides.
  2. In the center Attachments pane, click the attachment to select it, and then in the Action pane, in the Attachment area, click Delete.
  3. On the Are you sure that you want to delete the attachment? confirmation message, click Yes to delete the attachment, or click No to cancel this action.
    Note: You cannot delete security guide attachments associated with Microsoft baselines in the tool.