This is your framework, if you have multiple files to import then I would suggest a wizard instead.
Wizard framework would be:
1) prompt the user to select a file (of a certain type you might check for, can be a column name - header)
2) if it passes validation then import the data (and process it)
2b) if doesn't pass report it wasn't a valid file and prompt again
3) prompt for the next file type
......
I have a project like this that takes 4 different data "dumps" and merges them into a summary workbook each month.
But for a single file of changing name, here you go for a framework:
you can eliminate cycling through all of the worksheets if there is only one
you might also not be appending data to what already exists, but that is what finding the new last row is for.
Option Explicit
'Sub to get the Current FileName
Private Sub getFN()
Dim Finfo As String
Dim FilterIndex As Long
Dim Title As String
Dim CopyBook As Workbook 'Workbook to copy from
Dim CopySheet As Worksheet 'Worksheet to copy from
Dim FN As Variant 'File Name
Dim wsNum As Double 'worksheet # as you move through the Copy Book
Dim cwsLastRow As Long 'copy worksheet last row
Dim mwsLastRow As Long 'master worksheet last row
Dim masterWS As Worksheet 'thisworkbook, your master worksheet
Dim rngCopy1 As Range
Dim rngCopy2 As Range
Set masterWS = ThisWorkbook.Worksheets("Master Security Logs")
'Set up file filter
Finfo = "Excel Files (*.xls*),*.xls*"
'Set filter index to Excel Files by default in case more are added
FilterIndex = 1
' set Caption for dialogue box
Title = "Select the Current AP Reconcile Workbook"
'get the Forecast Filename
FN = Application.GetOpenFilename(Finfo, FilterIndex, Title)
'Handle file Selection
If FN = False Then
MsgBox "No file was selected.", vbExclamation, "Not so fast"
Else
'Do your Macro tasks here
'Supress Screen Updating but don't so this until you know your code runs well
Application.ScreenUpdating = False
'Open the File
Workbooks.Open (FN)
'Hide the file so it is out of the way
Set CopyBook = ActiveWorkbook
For wsNum = 1 To CopyBook.Sheets.Count 'you stated there will be 8, this is safer
'Do your work here, looks like you are copying certain ranges from each sheet into ThisWorkbook
CopySheet = CopyBook.Worksheets(wsNum) '1,2,3,4,5,6,7,8
'Finds the lastRow in your Copysheet each time through
cwsLastRow = CopySheet.Cells(CopySheet.Rows.Count, "A").End(xlUp).Row
'Set your copy ranges
Set rngCopy1 = CopySheet("D2:D"&cwsLastRow) 'this is your D column
Set rngCopy2 = CopySheet("I2:I"&cwsLastRow) 'this is your I column
'so you would have to keep tabs on what the lastRow of this sheet is too and always start at +1
mwsLastRow = masterWS.Cells(masterWS.Rows.Count, "A").End(xlUp).Row
'Copy the ranges in where you want them on the master sheet
'rngCopy1.Copy destination:= masterWS.Range("D"&mwsLastRow+1)
'rngCopy2.Copy destination:= masterWS.Range("I"&mwsLastRow+1)
'Clear the clipboard before you go around again
Application.CutCopyMode = False
Next wsNum
End If
'Close the workbook opened for the copy
CopyBook.Close savechanges:=False 'Not needed now
'Screen Updating Back on
Application.ScreenUpdating = True
End Sub