Hello and welcome to the forum,
Write Code. . . DB2/sql does not directly access "user" vsam files.
If you have a requirement where some of the data is stored in db2 tables and other data is stored in vsam files, you will need to write code (probably cobol) to perform the required actions.
This is quite common for applications that share data - one system is all db2, the other may be part or completely vsam.
When you have a question, you should start a new topic for your question.
Hope this helps,