The Calculation Algorithms extension is used to build calculation algorithms:

The Calculation Algorithms extension is used to design and execute complex calculations by practices and algorithms.
Key features:
Creating calculation practices as multilevel graphs on a single graphic workspace.
Using different data sources available from repository.
Configurable formula editor with built-in functions and applied script language.
Building algorithms on virtual sources (DataSet) without linking to specific data sources.
Parametrized and partial algorithm calculation.
To work with the Calculation Algorithms extension, one needs the feature PP_Modeling.
To get stared with the extension, see the Getting Started with the Calculation Algorithms Extension article.
If you still have questions, see the Questions and Answers article.
See also:
Getting Started with the Calculation Algorithms Extension | Questions and Answers