Internal transfers
Internal transfers are when a student transfers from one of Columbia's schools to another school also at Columbia.
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Between CC and SEAS
Students rarely transfer from SEAS to CC, but it's nevertheless possible. To apply for this transfer, a candidate must fill out the same application as transfer candidates from other schools, but the application fee is waived. Supposedly, there is a special internal transfer pool, so internal candidates are not lumped into the application pool from other schools (of which ~5% is accepted). No data is available on how many students successfully attempt to transfer between SEAS and CC per year, but supposedly there were 11 successful candidates in 2003-2004.
Between CC/SEAS and GS
If you drop out and aren't allowed back as a CC/SEAS student, you may be able to return via GS. There is apparently a procedure for transferring from GS to CC/SEAS but there are no documented cases of this occurring.
Between CC/SEAS and Barnard
Haven't heard of any cases of CC/SEAS transferring to Barnard, but although infrequent, the Barnard to CC/SEAS does occur.