The first is, within oneworld, right click and export a selection from the grid
The second way, is to use ODBC, you will need database password to do this, since it does not use the jde security.
From excel, Click Data-> Import Export Data ->New Data base Query - select your odbc.
Now a few notes is you are not familiar with ODBC, then don't use it, there are some danger.
Also there are a few tools out there that might help you, try downloading OW INFO, I think the demo lets you open 1 table so you can see how it works.