How can I call multiple functions at same time in AngularJS

I'm not sure i understand the question but if you want to call functions synchronously (wait until one function finished) then use the callback functions.

$scope.PrintOWTickets = function(TicketNo, MobilNo) {
    $http({
        method: "GET",
        url: $scope.ip + '/getPrintTicekt?TicketNo=' + TicketNo + '&PassengeMobile=' + MobilNo + '&PassengeEmail=' + MobilNo + '&ClientId=' + $scope.clientidFromFactory + ''
    }).then(function(response) {
        $scope.PrintOW = response.data;
        if (response.data.error == 1) {
            alert("Error");
        } else {
            function1(function() {
                function2();
            }); // if it is success then call function2
        }
    })
};

function function1(callback) {
    console.log("one")
    // do whaterver and return the callback
    callback();
}

function function2() {
    console.log("two")
}

function1(function() {
  function2();
});

function function1(callback) {
  console.log("one")
  // do whaterver and return the callback
  callback();
}

function function2() {
  console.log("two")
}

If it is a normal function you can write

if(function1()){
    function2();
}

If it is a HTTP or returns promise,

function1().then(function(){
    function2();
});