Generally, Denodo uses various mechanisms to connect to different data sources like JDBC, ODBC, REST API, etc., I will try one of the methods below to consume data from COBOL copybooks:
* Using the Attunity connector, from a third party vendor, which is accessible via JDBC to establish COBOL copybooks as a data source to Denodo.
* By creating a **custom wrapper** to access COBOL copybooks from a custom data source. Once the wrapper is created, it could be packaged into a JAR file and imported into the Virtual DataPort.
For more details, you can refer to [Developing Custom Wrappers](https://community.denodo.com/docs/html/browse/8.0/en/vdp/developer/developing_extensions/developing_custom_wrappers/developing_custom_wrappers) of the Virtual DataPort Developer section.
In case, if you still need help and if you are a valid Support User, you may open a Support Case at the Denodo Support Site and the Support Team will help you.
Hope this helps!