Indicate how to remove a direction (or list of directions, previously         
selected with Direction->Select, when 
Global is pressed).
Scope
When the 
Scope is 
All, the direction and all 
its contents is removed. This is the default.
When the 
Scope is 
Container, the direction is removed but
its contents (atoms, bonds, orbitals, texts) is saved, linked to the direction
parent. 
When the 
Scope is 
Contents, the direction is preserved but 
all its contents (atoms, bonds, orbitals, texts) is removed. Atomic 
directions are removed because they cannot live without the defining
atoms.
When the 
Scope is 
atom, 
bond, 
orbital or 
text, these objects are removed from the direction. When an atom 
used to define an atomic direction is removed, the direction is automatically 
removed.
When the removed direction included the current object,
the current layer becomes the new current object.
Clicking the mouse over a direction in the current layer, its identification
is transported to the dialog and 
Ok is automatically pressed.
To recover the previous state press 
Undo.