Description To allow vertical migration, select Device (Assignments menu) and click Migration Devices. Specify your list of migration devices. The Quartus® II software chooses the appropriate pin assignments. The Quartus II software will only allow you to use I/O pins that are common to all of the migration devices.
If one of the devices has pins that are VCC or GND but these same pins are user I/O on a different device that is in the migration path, the Quartus II software will ensure that these pins are not used as user I/O. You need to ensure that these pins are connected to the appropriate plane on the board.