$user = User::find(1); //any user we want to find $user->trophies()->attach($idOfTrophy); //pass id or array of a Trophy ids //suppose admin has selected the trophy from a form and trophy id// is in $request object, then.$trophyId = $request->trophy_id;$user->trophies()->attach($trophyId); //record is created in DB.attach and syncWithoutDetaching both does same job