Use this code to multi-select workbooks to open
Code:
Sub MultiSelectWorkbooks()
Dim GetFile As Variant
GetFile = Application.GetOpenFilename(FileFilter:="Excel Files (*.xls), *.xls", Title:="Open The Workbook", MultiSelect:=True)
On Error Resume Next
If GetFile <> False Then
On Error GoTo 0
For i = 1 To UBound(GetFile)
Workbooks.Open Filename:=GetFile(i)
Next i
End If
End Sub
You can't open a workbook into an existing workbook worksheet