Hi Pradyp,
unfortunately there is no approach I know of to make the customizing of this particular table 'smarter' or easier, you'll just have to bear with entering the data manually (I know this can be a pain if you have different provision variants and different trip types and different planning types etc. 
).
If you want the system to output an error message if the maximum amount is exceeded you have to use Amount Type 'E' --> "Error message when exceeded"; in your screenshot, however, you are using Amount Type 'B' --> "Reason for exceeding max rate is required"; here the system will only populate a message if you have maintained the reason-field to be visible for the respective expense type AND it is not filled by the enduser. So bottom line, if you just want a dull error message when exceeded whatsoever, use Amount Type 'E', not 'B'.
If you have different employee groups in TV which need different parameters for the settlement, it is reasonable to use the central parameters M/A Stat and/or M/A Entp; but keep in mind then you also need a dedicated entry in each and every customizing table.
Cheers, Lukas