The feature that can be used to meet this requirement in an Integration Procedure is Loop Block. Loop Block allows the designer to iterate over a collection of data and perform actions on each item. In this case, a Loop Block can be used to loop over each contact record in the list and perform a multi-step calculation using Calculation Actions or Calculation Procedures. Batch Action is not a feature in Integration Procedure, but a type of Action element that can perform bulk operations on data. Conditional Block is used to specify a condition that determines whether the actions inside the block will run or not. DataRaptor Transform Action is used to transform data from one format to another using templates.