How to give authorization on Amount wise??

Hi All,

My client want to give authorization to 3 different persons with amount limit

Ex: cleark 5000/-, Dep Mgr 50000?- and Manager---5,00,000 and more

and but cleark has to enter the document even upto 5lakhs amount but not to post to books of accounts just has to park

How to fix authorization for my FI users??

Good Day!!