Deactivating Periods

If you're building a forecast with part actual and part budget data, Deactivation will switch off your formulas in the actual months.

Deactivating periods will zero the data in that period, and switch off all formulas and budgeted employee payroll information for the period. This then makes it possible to copy actual data into the period without concern that your formulas might change the numbers. 

Go to Budgets > Manage Budgets and click the edit tool for the budget you wish to work on.