OK - So on your Oracle database you are using PL/SQL.
In Progress you can use the version of SQL that is considered to be the basic required functionality. This should mean that a lot of the clever stuff that Oracle have put in is not available, but the core command set is available.
As to classes, I don't think Progress offer a class in SQL92 since this is the industry standard, however they may be able to offer some consulting in how to do what you are trying to do. Contact your local Sales or Tech Support office to sort this out with them.
If you are doing straight replication then it may be best to consider PeerDirect.