Copy selected objects

Paste objects

Undo

Group objects

Duplicate selection in same place

Select all objects

Place workplane

Place ruler

Fit the view on selected object

Nudge selection on workplane, x and y axis

Pan view

Select multiple objects

Move selection vertically (z axis)

Hold Shift while moving to constrain movement to main direction

Nudge selection 10x, snap on workplane, x and y axis

Ungroup objects

Redo

Nudge selection 10x, snap up and down, z axis

Lock selection

Delete object

Hold Alt while starting to move to duplicate selection