This can be done by following basic steps for modifying the CAN dbc (CAN database file) for working with CAN-FD with help of NI-XNET Database Editor :
1.  Open
 NI-XNET Database Editor.   
2.  Select
 CAN Cluster and specify
 the 
I/O Mode to 
CAN FD3
.  Specify
 the 
FD Baud rate and 
Baud rate as per your application as shown in the below NI-XNET Database Editor:

NI-XNET Bus Monitor needs to be configured with the same setting as mentioned above.