xlDialogSaveAs - End ALL code if "cancel" is selected - vba

Question

EDIT: I figured it out myself. I feel pretty silly, but replacing "Exit Sub" with "End" works perfectly.
Background: I have a Sub that uses the "Call" function to run multiple subs within one Sub (see Code #1 below).
Option Explicit
Sub MIUL_Run_All()
Dim StartTime As Double
Dim SecondsElapsed As String
'Remember time when macro starts
StartTime = Timer
Call OptimizeCode_Begin
Call Format_MIUL
Call Custom_Sort_MIUL
Call Insert_Process_List
Call Format_Process_List
Call OptimizeCode_End
'Determine how many seconds code took to run
SecondsElapsed = Format((Timer - StartTime) / 86400, "ss")
'Notify user in seconds
MsgBox "This code ran successfully in " & SecondsElapsed & " seconds", vbInformation
End Sub
My first code that is called out, "Format_MIUL", prompts the user to save the file, using the following line of code (see Code #2 below). This code works, but the problem is that if the user presses the "Cancel" button, the rest of the code called out in the main sub (Code #1 above) will continue to run. I want ALL code to stop if the user presses the cancel button. I just can't seem to figure out how to do that.
'Save file as .xlsm
MsgBox " Save as Excel Workbook (.xlsx)!"
Dim userResponse As Boolean
On Error Resume Next
userResponse = Application.Dialogs(xlDialogSaveAs).Show(, 51)
On Error GoTo 0
If userResponse = False Then
Exit Sub
Else
End If
Any help is greatly appreciated.

Answer 1

The Call keyword has been obsolete for 20 years, you can remove it.
The End keyword will effectively end execution, but it's pretty much a big red "self-destruct" button that you effectively never need to use, given properly structured code.
Looks like Format_MIUL is a Sub procedure. Make it a Function and return a Boolean value that tells the caller whether it's ok to proceed, or if the rest of the operations should be cancelled:
Private Function Format_MUIL() As Boolean
'...
'Save file as .xlsm
MsgBox " Save as Excel Workbook (.xlsx)!"
Dim userResponse As Boolean
On Error Resume Next
userResponse = Application.Dialogs(xlDialogSaveAs).Show(, 51)
On Error GoTo 0
'return False if userResponse isn't a filename, True otherwise:
Format_MUIL = Not VarType(userResponse) = vbBoolean
End Function
And now instead of this:
Call Format_MIUL
The caller can do this:
If Not Format_MIUL Then Exit Sub
And there you go, graceful exit without any self-destruct buttons pressed.