To set a monthly budget target for any particular campaign, in any client account in your MCC, just apply our special "BudgetTarget XXX" label to any campaign that requires its own monthly budget target. Just replace XXX with a budget value (please see screenshot). Please ensure the budget target label has the correct format (i.e. BudgetTarget XXX with capital B and capital T, with space before the budget value).
Our Campaign Level Budget Pacer will then pace the spend on those campaigns to reach as close to the monthly spend target as possible, by pushing and pulling the spends on those campaigns on a daily basis.