Combining codes to write to another workbook - one to match/update and one to write new

[WildBurrow]

Below is an outline of what how my books are set up and what the macros accomplish;

Workbook#1: Incident Workbook (IWB) - used to create incident reports. Both macros are in this workbook.
Workbook#2: Master Incident Data Tracker (MIDT) - functions as a summary sheet of all incidents and provides an incident number. Incident numbers are prepopulated in Column "A" and run from 1 through 300 on the "Master" worksheet.

Macro#1 Post to MIDT

• Post summary incident information from the incident workbook ("Export") worksheet to the master incident data tracker ("Master") worksheet.
• Obtains an incident number from the MIDT and pastes it in the IWB.

Macro#2 Update MIDT

• Uses a previously issued incident number from the incident workbook ("Export") worksheet to match a row of data in the master incident data tracker ("Master") worksheet.

Separately, the macros work well. I would like to combine the two so that:
If Column "A" of the IWB ("Export") worksheet is blank (no incident number) then

Find last row of data in MIDT ("Master") worksheet (based on value in Column "B")​

Copy/paste values from IWB ("Export") worksheet to the MIDT ("Master") worksheet​

Copy the incident number from the MIDT ("Master") worksheet Column "A"​

Paste the incident number to the IWB ("Export") worksheet Column "A"​

​

If Column "A" of the IWB ("Export") worksheet is NOT blank (has an incident number) then

Match IWB ("Export") worksheet Column "A" with MIDT ("Master") worksheet Column "A"​

Copy/paste values from IWB ("Export") worksheet the MIDT ("Master") worksheet​

Below are my current macros. I've removed some of the preliminary code (e.g. application.screenupdating = false) to save space.

Sub PostToMIDT()
Dim FileToOpen As Variant, OpenBook As Workbook, ws As Worksheet, strFilePath As String
Set ws1 = ThisWorkbook.ActiveSheet
'Allow user to select applicable MIDT
    FileToOpen = Application.GetOpenFilename(Title:="Browse for your File", FileFilter:="Excel Files(*.xls*), *xls*")
        If FileToOpen <> False Then
            Set OpenBook = Application.Workbooks.Open(FileToOpen)
               'Run macro if file is not open by another user
                If OpenBook.ReadOnly = False Then                
                    'Unmerge IWB Incident number before transfer of data
                    ws1.range("O262:Q262").UnMerge                    
                    'Copy Export data to MIDT Master Sheet
                    ThisWorkbook.worksheets("Export").range("B2:AV2").Copy
                    OpenBook.Sheets("Master").range("B1").End(xlDown).Offset(1, 0).PasteSpecial Paste:=xlPasteFormats
                    OpenBook.Sheets("Master").range("B1").End(xlDown).Offset(1, 0).PasteSpecial xlPasteValues                    
                    'Copy Incident Number from MIDT
                    ActiveCell.Offset(0, -1).Copy                    
                    'Paste Incident Number to IWB form
                    ws1.range("O262").PasteSpecial xlPasteValues                    
                    'Merge IWB Incident Number fields
                    ws1.range("O262:Q262").Merge                    
                    'Protect MIDT sheet and close file
                    OpenBook.Sheets("Master").Protect ("Fieldops")
                    OpenBook.Close True
                Else
                    'Close MIDT and notify user that the file is in use and cannot be accessed
                    OpenBook.Saved = True
                    OpenBook.Close
                    Msgbox "The MIDT is currently open by another User. Please try again later."
                    Exit Sub
                End If        
                Msgbox "Incident Information has been saved to the MIDT"
        End If
            If FileToOpen = False Then
            Msgbox "You have cancelled the selection process. The MIDT will not be updated"
            End If

Sub ExportUpdatedData()  
Dim FileToOpen As Variant
Dim OpenBook As Workbook        
'Allow user to select applicable MIDT
FileToOpen = Application.GetOpenFilename(Title:="Select Incident Tracking Sheet", FileFilter:="Excel Files(*.xls*), *xls*")
    If FileToOpen <> False Then
        Set OpenBook = Application.Workbooks.Open(FileToOpen)            
        'Run macro if file is not open by another user
        Set Master = ThisWorkbook.Sheets("Export Data") 'Incident Workbook (IWB)
        Set Slave = OpenBook.Sheets("Master") 'Master Data Tracker Sheet (MDIT)                
            'Run macro if file is not open by another user
            If OpenBook.ReadOnly = False Then
                For j = 1 To 400
                For i = 1 To 400                    
                If Trim(Master.Cells(j, 1).Value2) = vbNullString Then Exit For
                If Master.Cells(j, 1).value = Slave.Cells(i, 1).value Then                         
                    Master.Cells(j, 2).Copy 'MDIT Column B (Status) is equal to IWB Column B (Status)...etc.
                    Slave.Cells(i, 2).PasteSpecial Paste:=xlPasteValues                       
                    Master.Cells(j, 3).Copy 'Incident Classification
                    Slave.Cells(i, 3).PasteSpecial Paste:=xlPasteValues                        
                    Master.Cells(j, 4).Copy 'Type of Incident
                    Slave.Cells(i, 4).PasteSpecial Paste:=xlPasteValues                        
                    Master.Cells(j, 5).Copy 'Call Source
                    Slave.Cells(i, 5).PasteSpecial Paste:=xlPasteValues                        
                End If
                Next
                Next           
                OpenBook.Sheets("Master").Protect ("Fieldops")
                OpenBook.Close True            
            Else            
            'Close MIDT and notify user that the file is in use and cannot be accessed
            OpenBook.Saved = True
            OpenBook.Close
            Msgbox "The MIDT is currently open by another User. Please try again later"
            Exit Sub
            End If
        Msgbox ("The Incident Tracking Sheet has been updated")
        End If        
    If FileToOpen = False Then
        Msgbox "You have cancelled the selection process. The MIDT will not be updated"
        End If            
    End If     
End Sub

[/CODE]

I have tried combining the codes but it would either write 400 lines of the same incident data, write nothing, or bug out. I'm sure it has to do with the way I'm address the "If Trim(Master.Cells(j, 1).Value2) = vbNullString Then Exit For" but can't figure out the fix. Any help in pointing me in the right direction will be greatly appreciated.