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In the Analyze Data From and To fields, select the start and end dates, respectively, of the date range for selecting the cost data. Generally, it is a month.
In the Expense Items for Allocation pane (to the left), click the Fill by Accounting Data button to populate the list of expense items for allocation. Only expense items for which expenses were recorded in the selected period appear in the list; then, you can remove the unneeded expense items (by using the context menu that opens on right-click) or add other items (by using the Add button). Alternatively, you can manually create a list of expense items (whose amounts you need to allocate) by using the Add button.
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