[
	{"keys": ["f1"], "command": "unfold_all"},
	{"keys": ["f2"], "command": "fold_by_level", "args":{"level":2}},
	{"keys": ["f3"], "command": "toggle_setting", "args": {"setting": "word_wrap"}}
]

Reference:

• Examples:
  http://stackoverflow.com/questions/18819920/fold-collapse-the-except-code-section-in-sublime-text-2
• Commands:
  http://docs.sublimetext.info/en/latest/reference/commands.html
• Key Bindings:
  http://docs.sublimetext.info/en/latest/reference/key_bindings.html