Senses
至于/ 至於 as for
Connects to a new topic or mentions a related matter; as for, as to, or regarding
至于/ 至於 to go so far as
To reach a certain point or result in a certain situation, often used in negative sentences or rhetorical questions to mean "go so far as to" or "to that extent"
至于/ 至於 to arrive at
(Literary) to arrive at or reach a certain place