This means that users should be able to populate a budget line, such as Hotel, using data from the last period with an adjustment. It also requires that the system allow users to enter a value for the year, then have that spread back automatically based on the prior year's proportionality.
Scenario: An international retail company is using a budgeting tool for its financial planning. Every year, the company adjusts its budgets based on the prior year's actual performance and the projected goals for the new year. For some accounts they'd like to leverage last year's data +5% growth. For other accounts, they have a firm goal in mind and would like to have the system automatically breakback the number.
Solution: The CPM software allows the users to manually enter a new budget sum, and it then automatically spreads this sum across the individual accounts based on the proportion of the prior year actuals. For other accounts, they're able to simply add 5% to the prior year's results. This gives a fair and accurate representation of the intended allocations, considering historical performance and future expectations.
This is a great feature for quickly populating a budget while respecting the seasonality of the data. Products with this feature can look at a specific account and populate budget values to the preceding quarters, months, weeks with some sort of adjustment (percentage, dollar amount) in an instant. There are usually many methods, with proportional breakbacks being very common, along with simply adding a value for the year and asking the system to split it for the 12 months.
Some tools take this a step further and allow the user to apply the spread to many accounts at once. This makes budgeting for a department a snap. At minimum, it can be used as a guideline for the budgeter as they enter their information.