Create a relation by dragging a slave component over a master component to display attachment points. When the required attachment is displayed, drop the slave component to create the relation.
For example:
In this example, the top face is highlighted, and an arrow indicates a plane attachment:
In this example, a plane to plane relation is created between the slave and master component. The new relationship is added to the assembly tree.
If you release the mouse away from the master component, no relationship is created, and the slave component returns to its original orientation.