The Mark to Assign command is used to make a selection of signals or pins and assign just those signals or pins when Assign > Assign Pins or Assign > Assign Pins with Overwrite is chosen. To mark signals or pins for assignment, use the following procedure:
Marked signals are displayed in the Signals List and Pins List with an animated boundary. In the Device Window marked pins blink continuously. Marked signals or pins remain marked until the assignment is made.
Marked signals or pins can be unmarked by right-clicking on the selection and choosing Remove Marks.