To Attach a Raster Reference

Select the Attach tool ( Drawing > Attach > Raster ).

The Attach Raster Reference dialog opens.
Use controls in the Attach Raster Reference dialog to select the required raster file, method of attachment, and views in which to display the image.
Use the Open Settings Dialog toggle to display the Raster Attachment Options dialog which allows you to define different settings for the attachment.
Click Open.
In the Raster Attachment Options dialog, adjust any settings as necessary and click Attach.