How can you create a parametric feature in a model?

Creating a parametric feature in a model involves defining relationships and variables that allow for flexible design adjustments. When a sketch dimension is defined as a parameter value, it establishes a direct link between that dimension and a specific variable. This means that any change made to the parameter's value automatically updates the associated dimension in the model, which allows for easy modifications and iterations of the design.

In parametric modeling, the ability to adjust dimensions dynamically is fundamental, as it aids in creating responsive designs that can quickly adapt to changes in requirements, enhancing the efficiency of the design process.

The other options do not directly contribute to creating parametric features. Fixed dimension constraints do not allow for dynamic changes; they lock the dimensions to specific values. Exporting parameters to another file may be useful for documentation or sharing but does not inherently create parametric features. Duplicating the sketch geometry creates copies without introducing variable relationships or dynamic adjustment capabilities. Therefore, defining a sketch dimension as a parameter value is the correct approach to establish parametrically driven features in a design.