Hi @ptchanchal,
You can see here how to pass parameter to a pop up.
https://docs.inductiveautomation.com/display/DOC80/Popup+Windows
Once you have your parameter inside the pop up, you can perform your CRUD,
then when you finish you may consider to use the function
system.db.refresh()
https://docs.inductiveautomation.com/display/DOC79/system.db.refresh
to update your table and show up your changes.
Grab your selected row elements from the table :
If you like to pass parameters from script :
window = system.nav.openWindow('TestPopUp', {'Int' : 40})
system.nav.centerWindow(window)
here we are opening a pop up called "TestPopUp", passing parameter as a Dict.