The Formula Expert enables the creation of formulas from existing custom functions. The Formula Extractor enables the exact opposite the creation of custom functions from previously created formulas. This functionality is accessible by creating a new Custom Report Function and selecting the Use Extractor button. Figure 10.23 displays the Extract Custom Function from Formula dialog box accessed when creating custom report functions. Figure 10.23. The Extract Custom Function from Formula dialog.By using the Formula Extractor, it is possible to migrate existing formula logic from a formula field into a custom function. The appropriate part of the migrated formulas can subsequently be replaced with the new custom function and eventually be added to the Crystal Repository. To create a custom function from an existing formula using the Formula Extractor dialog, follow these steps:
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