Hello Gita,
For your 1st point, are you trying to only update the existing record? So for instance, if you update Dalal to Dalal 35 then only the name should be replaced but everything stays the same? If so, then you would want to check your actions to ensure you only have Save or Save all sections on that button.
For your 2nd point, is it that you would like a prompt letting you know that you are about to duplicate the entry, with options to proceed or not to proceed? If this is the case, then yes, you can do so. You can add a 'Show Message' action with Yes and No options, before the 'Insert Records Into Table' action.
Hope this helps.