Making dimension styles available to other drawings.

Hi,

when a create a new dimension style (Format>Dimension Style...Drafting Styles>New>Activate all new dimensions created in the current drawing are created using the new style.

However, when I close the drawing and open an existing drawing or when I create a new drawing the dimensions style I created above is no longer available as an option.

How do I make a new dimension style available to all drawings?

Regards,