By 'proxy' table, I am assuming you mean that this is a Table in Sybase which maps to a remote table/view/procedure.
In DB2, if you want to access non-DB2 data sources natively (ie via SQL), then you need to use the Federation technology in Websphere Information Integrator, and using this, you can define remote servers (ie a Sybase databases), and nicknames (ie a Sybase Table). You can then access the data as if it were a local DB2 Table.
If you want to physically move the data from Sybase to DB2, then you have
many options, such as II above, export/import, etc., but I believe moving this scenario is more complex then a simple export/import.
There is an useful article on using II and Sybase:
http://www-128.ibm.com/developerwork...m-0406purnell/
The best source of information for Sybase -> DB2 Migarations is:
http://www-128.ibm.com/developerwork...igrate/db.html
Graham Martin
http://www-306.ibm.com/software/data/db2/migration/