Edit menu
Undo — Reverse the most recent change you made to the document. You can keep stepping backwards like this if there are more changes you want to undo.
Redo — Reenact the last change you undid. You can keep stepping forward through however many Undo commands you made.
Cut — Remove the selected text or items, putting them on the clipboard so you can paste them somewhere.
Copy — Put a copy of the selected text or items on the clipboard, so you can paste them somewhere.
Copy As Link — Put a link to the selected items on the clipboard, so you can paste it somewhere. This link uses the OmniPlan URL format.
Paste — Take whatever's on the clipboard and insert it at the current selection. If the clipboard contains just text (not whole items), and you are editing the text of an item, the text is pasted at the insertion point. Otherwise, the contents of the clipboard are pasted as new items.
Delete — Get rid of the selected items.
Select All — Select every item in the outline, or if you are editing an item's text, all text in the cell.
Deselect All — Clear the selection completely so that nothing is selected.
Edit Note — Move from the item text to the notes area of an item, or move back from the note area to the item text.
Find — This submenu contains the standard Find commands included in many Mac OS X applications: Find (which opens the Find window), Find Next, Find Previous, and Enter Selection (which enters the selected text as the text to search for).
Spelling — This submenu contains the standard Spelling commands for Mac OS X's spell checking system: Spelling (which opens the Spelling window), Check Spelling (which checks spelling in the document once), and Check Spelling As You Type (which turns the automatic spell checking on or off).
Special Characters — Open the Mac OS X Character Palette, where you can find characters not easily accessible from the keyboard.