Select the Key Bindings - User item under Sublime's Preferences, then add the following example line:
{"keys": ["ctrl+shift+c"], "command": "insert_snippet", "args": {"contents": "hello!"}}
This will add a CTRL+SHIFT+C shortcut to insert the hello! snippet.
By the way, don't forget to add a comma to the previous key binding hash so that all but the last line end with a comma. i.e.:
[
{"keys": ["..."], "command": "..." },
{"keys": ["..."], "command": "..." },
{"keys": ["..."], "command": "..." },
{"keys": ["ctrl+shift+c"], "command": "insert_snippet", "args": {"contents": "hi!"}}
]
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