Also from within the Schematic Viewer window you can select Tools > Find from the menu to load the Graphical Find dialog window. This window allows for a filtered search of netlist objects, cross-references to schematics, RTL or HDL Designer. You also can set constraints from the Find window.

Here is a view of the Graphical Find window. You can search for any object through your design hierarchy and you can apply constraints from this window if you wish.