Step 2: Constrain your Design
After adding design files to the project, you assign design elements to I/O pins, and apply appropriate timing constraints to correctly optimize fitting and analyze timing for the design.
In addition to device I/O pins and timing constraints, the Intel® Quartus® Prime Pro Edition software allows you to define placement and hierarchical constraints.
For more information, refer to the Intel® Quartus® Prime Pro Edition User Guide: Design Constraints.