There are five utilities that support advanced behavior in ModelBuilder. You can add a utility to your model by clicking ModelBuilder > Insert > Utilities and selecting the utility you wish to add.
The Calculate Value tool returns a value based on a specified Python expression.
The Collect Values tool is designed to collect output values of an iterator or to convert a list of multivalues into a single input. The output of Collect Values can be used as input to tools like Merge, Append, Mosaic, and Cell Statistics.
The Get Field Value tool gets the value of the first row of a table for the specified field.
The Parse Path tool parses the input into its file, path, name, or extension. The output can be used as inline variables in the output name of other tools.
The Select Data tool selects data in a parent data element, such as a folder, geodatabase, feature dataset, or coverage.