After defining weaving links between right and left metamodels, you could create an association between links to express some domain specific relation (for example a foreign constraint). You must do the same as for creating a link (with the menu or drag and drop), and than define the associated links.
You can see the final result in the following screen shot. When an
association is selected all the related elements as also selected for a
better link visualization
You can then save all the created elements or anulate the operations
using undo-redo menus. The created weaving model is saved in a ".xmi"
format into the workspace.