Patrick's code does not work for Worksheets (in fact, it will transfer the code to the wrong module). A workaround is to create a new sheet in the destination workbook, and then copy the code over (optionally you can copy and paste the worksheet data/functions/formatting as well).
The other thing that doesn't work is UserForms. You can copy the code over, but I'm not aware of any way to copy the actual form (including all the controls) without using the export/import method.
Expanding on Patrick's code:
'Needs reference to : Microsoft Visual Basic for Application Extensibility 5.3 ,
'or run this code : thisworkbook.VBProject.References.AddFromFile "C:\Program Files (x86)\Common Files\Microsoft Shared\VBA\VBA6\VBE6EXT.OLB"
'from immediate window (ctrl+G) or create a small sub
' What works: Successfully tranfsers Modules with code and name
' Copies userform code and name only, but the form is blank (does not transfer controls)
' Copies code in sheets but no content (optionally add code to copy & paste content)
' Successfully transfers Classes with code and name
Option Explicit
Public Sub CopyComponentsModules() 'copies sheets/Thisworkbook/Userforms/Modules/Classes to a new workbook
Dim src As CodeModule, dest As CodeModule
Dim i&
Dim WB_Dest As Workbook
Dim Ref As Reference
Dim Comp As VBComponent
Dim sht As Worksheet
Debug.Print "Starting"
Set WB_Dest = Application.Workbooks.Add
On Error Resume Next 'needed for testing if component already exists in destination WorkBook and for cross-references
For Each Comp In ThisWorkbook.VBProject.VBComponents
Debug.Print Comp.Name & " - "; Comp.Type
Err.Clear
'Set Source code module
Set src = Comp.CodeModule 'ThisWorkbook.VBProject.VBComponents("Sheet1").CodeModule
'Test if destination component exists first
i = 0
i = Len(WB_Dest.VBProject.VBComponents(Comp.Name).Name)
If i <> 0 Then 'or: if err=0 then
Set dest = WB_Dest.VBProject.VBComponents(Comp.Name).CodeModule
Else 'create component
Err.Clear
If Comp.Type = 100 Then
Set sht = WB_Dest.Sheets.Add
Set dest = WB_Dest.VBProject.VBComponents(sht.Name).CodeModule
WB_Dest.VBProject.VBComponents(sht.Name).Name = Comp.Name
sht.Name = Comp.Name
Else
With WB_Dest.VBProject.VBComponents.Add(Comp.Type)
If Err.Number <> 0 Then
MsgBox "Error: Component " & Comp.Name & vbCrLf & Err.Description
Else
.Name = Comp.Name
Set dest = .CodeModule
End If
End With
End If
End If
If Err.Number = 0 Then
'copy module/Form/Sheet/Class 's code:
dest.DeleteLines 1, dest.CountOfLines
dest.AddFromString src.Lines(1, src.CountOfLines)
End If
Next Comp
'Add references as well :
For Each Ref In ThisWorkbook.VBProject.References
WB_Dest.VBProject.References.AddFromFile Ref.FullPath
Next Ref
Err.Clear: On Error GoTo 0
Set Ref = Nothing
Set src = Nothing
Set dest = Nothing
Set Comp = Nothing
Set WB_Dest = Nothing
End Sub