Hi Thirup,
This table from your screen will be having a node assigned to it , find out the node and add the required new fields to the same node and create the same fields in the UI by using Bind table option , and find out the method which takes the node value and save it into database inside save button and add the new logic also to the same place to store the value into Ztable.
please let me know if anymore help is required.
- Gowtham