Use this function to copy selected levels to a new parent level.
Using the Function:
Select Copy Levels from the View>Level submenu.
Enter the source level number or select the entities associated with the level(s) you wish to copy.
Enter the destination level number, or select OFFSET to enter an offset value by which new parent levels will be created. The source levels are copied to the sum of the source level number and the offset value. You can also use the Windows style drag and drop by holding down the Ctrl key and picking levels/sublevels and dragging to new level.