Conversion of columns during CSV Import

Hello,

is there any possibility to convert special columns during an CSV import
via COPY?
For example:

HELLO;WORLD;9999;011001

9999 should be converted to a character field
011001 to the date 10th January 2001

For the moment the only idea we have is, to import the CSV into a TEMP
table and
perform the conversion by a select from the temp to the target table.

Thanks for any idea.

Regards,

Patrick