This function is to speed up the process of inserting an automatic cross reference.
Place your cursor at the point where you would like the cross reference to be inserted, click the “Insert reference” button (pro-tip: if you add the function to the quick access toolbar (right click on the button) then you can open it by pressing Alt-[number] without having to use the mouse). Start typing the number of the clause reference to be inserted in the box provided and you will then see in the window below all possible choices for that clause number. If you have the same clause number in an agreement and also the schedules attached to it there will be multiple choices to choose from.
Select the relevant clause (you can use the up and down arrows) and hit enter to insert the cross reference.
Recent clause references will be shown in the bottom box.