I have a page with many objects and every object has duplicated with a copy of it exactly on it (every copy of each object overlapped exactly on it at same layer). I want to select only under objects with rubber band selection method (I can not select each under object one by one with Alt+click tric...

A good trick is here! You could use "Inset/Outset Halo" extension at "Extensions > Generate from Path > Inset/Outset Halo...": Use Lowest Values: Width:1 Number of steps:5 This makes 5 extra objects. Select all and ungroup it 5 times and delete main object. Objects are above each...