What does bottom-up budgeting mean?

bottom-up budgeting meaning in Law Dictionary

as opposed to top down cost management, most of the budgets which are previously made by managers of divisions are created into one the requirements for the whole business.

bottom-up budgeting meaning in Business Dictionary

technique where (as opposed to top-down cost management) spending plans served by the managers of all of the divisions are combined to compute the resource requirements for the entire company.