The button Assign part number is used in order to access the Parts manager directly and choose a part from the database.
If the option 'Contactors Online...' is active in the dialog, all the modified contactor data such as comb, contact pins and cross references are updated in the drawing as soon as you leave the Materials browser. If the field is not active, once you have quit out of the dialog a further dialog is displayed. Select OK to write the modifications into the drawings.
Hint
If you use this function, it can take a little time to update the drawings