Agreement Spent amount and amount limit

Hi All,

is it possible to pass the agreement through approval path against only the amount changed? Ex. The Agreement amount limit is 10k and has been approved with user "A" who have approval limit of 10k,

The amount released on the agreement, 10K.

Now, they re-new the agreement and increase the amount limit by 100 hundred , to become 10100,

when submitting the agreement for approval, it won't get approve by user "A"  and need the approval form user "B"

isn't suppose that the system ignore the amount already released and get the approval against the new amount which is 100 hundred.

Your advice please