adjustment to the budget row cost amount but within the amount of the budget it doesn't go approval

Summary:

i have a requirement that when the business user make adjustment to the budget row cost amount but within the amount of the budget it doesn't go though the approval hierarchy to be auto approved

Content (please ensure you mask any confidential information):

Hello,
i have a requirement that when the business user make adjustment to the budget row cost amount but within the amount of the budget it doesn't go though the approval hierarchy to be auto approved

let's say that
the current bassline budget version1 of total 10000 $
5000$ on task 1
5000$ on task 2

and the budget version 2 of total 10000$