How to auto populate a single spreadsheet from multiple spreadsheets - excel

Question

I have a set of Excel spreadsheets to summarise. My sheets are numbered:
xxx-yy-zzzz; xxx-yy-zzz+1; etc.
I would like a reporting spreadsheet to retrieve information each time it is opened. I don't mind doing it with VBA or with formulae.
I've the macro below. I need to auto increment until it runs out of spreadsheets. All the files will be in the same folder, this file can be in any folder.
Sub Macro1()
'
' Macro1 Macro
' autopop
'
'
Range("C4").Select
ActiveCell.FormulaR1C1 = "='[413-05-001.xlsx]Cover'!R4C5"
Range("D4").Select
ActiveCell.FormulaR1C1 = "='[413-05-001.xlsx]Cover'!R5C3"
Range("E4").Select
ActiveCell.FormulaR1C1 = "='[413-05-001.xlsx]Order'!R27C9"
Range("F4").Select
ActiveCell.FormulaR1C1 = "='[413-05-001.xlsx]Cover'!R8C9"
End Sub

Answer 1

Siddharth's method above worked very well for when we were using very simple file names, but it got a lot harder when there were additions made to the filename... So i did some surfing and found a basis of a "list all files and put them in a worksheet" and using some of the code from Siddharth's answer above (thank you very much Mr. Siddharth) and the example i found online here http://alanmurray.blogspot.com/2013/08/excel-vba-list-all-excel-files-in-folder.html , i have finalised my code, and my little VBA app now does what i want - it opens a folder and goes through and pulls out particular cells and creates a summary report in seconds -> will save me hours of tedious work...
Code:
Sub ImportFileList()
Dim MyFolder As String 'Store the folder selected by the using
Dim FiletoList As String 'store the name of the file ready for listing
Dim NextRow As Long 'Store the row to write the filename to
On Error Resume Next
Application.ScreenUpdating = False
'Display the folder picker dialog box for user selection of directory
With Application.FileDialog(msoFileDialogFolderPicker)
.Title = "Please select a folder"
.Show
.AllowMultiSelect = False
If .SelectedItems.Count = 0 Then
MsgBox "You did not select a folder"
Exit Sub
End If
MyFolder = .SelectedItems(1) & "\"
End With
'Dir finds the first Excel workbook in the folder
FiletoList = Dir(MyFolder & "*.xls")
Range("A1").Value = "Filename"
Range("B1").Value = "Purchase Order Number"
Range("C1").Value = "Vendor"
Range("D1").Value = "Date of PO"
Range("E1").Value = "Currency"
Range("F1").Value = "Subtotal"
Range("G1").Value = "VAT"
Range("H1").Value = "Total"
Range("A1:H1").Font.Bold = True
'Find the next empty row in the list
NextRow = Application.CountA(Range("A:A")) + 1
NextRow = NextRow + 1 ' skip a line
'Do whilst the dir function returns an Excel workbook
Do While FiletoList <> ""
Cells(NextRow, 1).Value = FiletoList 'Write the filename into the next available cell
Cells(NextRow, 2).Formula = "='[" & FiletoList & "]Cover'!R4C4" ' Cover is the excel sheet name
Cells(NextRow, 3).Formula = "='[" & FiletoList & "]Cover'!R6C3"
Cells(NextRow, 4).Formula = "='[" & FiletoList & "]Cover'!R4C7"
Cells(NextRow, 5).Formula = "='[" & FiletoList & "]Cover'!R21C4"
Cells(NextRow, 6).Formula = "='[" & FiletoList & "]Cover'!R19C5"
Cells(NextRow, 7).Formula = "='[" & FiletoList & "]Cover'!R20C5"
Cells(NextRow, 8).Formula = "='[" & FiletoList & "]Cover'!R21C5"
NextRow = NextRow + 1 'Move to next row
FiletoList = Dir 'Dir returns the next Excel workbook in the folder
Loop
Application.ScreenUpdating = True
End Sub

Answer 2

Is this what you are trying? (UNTESTED)
'~~> Change this to the directory which has .xlsx files
Const sDir = "C:\Temp\"
Sub Sample()
Dim ws As Worksheet
Dim i As Long, num As Long, Calcmode As Long
Dim FilesCount As Long, startNum As Long
On Error GoTo Whoa
Set ws = ThisWorkbook.Sheets("Sheet1")
With Application
.ScreenUpdating = False
Calcmode = .Calculation
.Calculation = xlCalculationManual
End With
'~~> Get the number of files in that directory
FilesCount = getFileCount(sDir)
startNum = 1
If FilesCount <> 0 Then
With ws
For i = 4 To (FilesCount + 3)
num = Format(startNum, "000")
.Range("C" & i).Formula = "='[413-05-" & num & ".xlsx]Cover'!R4C5"
.Range("D" & i).Formula = "='[413-05-" & num & ".xlsx]Cover'!R5C3"
.Range("E" & i).Formula = "='[413-05-" & num & ".xlsx]Order'!R27C9"
.Range("F" & i).Formula = "='[413-05-" & num & ".xlsx]Cover'!R8C9"
startNum = startNum + 1
Next i
End With
End If
LetsContinue:
With Application
.ScreenUpdating = True
.Calculation = Calcmode
End With
Exit Sub
Whoa:
MsgBox Err.Description
Resume LetsContinue
End Sub
Function getFileCount(s As String) As Long
Dim Path As String, Filename As String
Dim Count As Long
Path = s & "*.xlsx"
Filename = Dir(Path)
Do While Filename <> ""
Count = Count + 1
Filename = Dir()
Loop
getFileCount = Count
End Function