Greetings Rani,
If you are talking about a planned fail over, you can trigger a rebuild of the structure onto another CF without loss of data using an operator command for example:
'SETXCF START,REBUILD,STRNM=DFHXQLS_CST1S,LOC=OTHER'
However, data in a SIMPLEX CF structure is at risk from failure in the structure or the CF regardless whether marked recoverable in CICS and such a failure will cause the contents of the structure to be lost. I'd suggest you use duplex structures so the system maintains a second copy of the structure and will switch to the alternate.
There is a slight "gotcha" if you have two CFs, your structures can be duplex but if you loose a CF (planned or unplanned) the structures are still there but unless there is a third CF with enough space in the CFRM policy for the structure it becomes simplex (so at risk if that CF or structure fails) until the CF is restored.
The CICS CF severs can also be ARM enabled.
https://www.ibm.com/docs/en/cics-ts/6.x?topic=processes-system-managed-list-structure-duplexing in the CICS Documentation has some information about CF Duplexing and from https://www.ibm.com/docs/en/zos/3.2.0?topic=rebuild-controlling-use-duplexing-process, you need the DUPLEX keyword in the CFRM parameter but https://www.ibm.com/docs/en/zos/3.2.0?topic=resources-installation-guide-duplexing-rebuild may be a good starting point.
There is a tool to cause errors in a CF structure (for testing) documented at https://community.ibm.com/community/user/viewdocument/injerror-a-tool-to-inject-errors-i?CommunityKey=2a2f855c-5950-4a9d-8485-86645982646a&tab=librarydocuments