Link documents to workitems in RTC

Hi All,

Request help in Link section of a workitem.

There are few requirement documents which are stored in the source stream .. those documents need to be linked in the workitem links section..

Now in the Editor presentation when I add a link section and click on "Add Presentation" ...I am seeing

NAME:
KIND:
LINK TARGET:
LINK TYPE :

I have searched in google...few posts are showing that you will see "Add Related documents" when you right click in the Links section and some posts are asking to add this as a pre-condition but I do not see option as "Add Related documents"

How to add a new link type by which I can add documents ?

Request help on the same.

Thanks & Regards,
Sandhya