Like so:
Option Explicit
Sub RowsToMultiRows()
Dim LR As Long, RW As Long
Application.ScreenUpdating = False
LR = Range("A" & Rows.Count).End(xlUp).Row
For RW = LR To 2 Step -1
Range("A" & RW).EntireRow.Copy
Range("A" & RW + 1).Resize(3).EntireRow.Insert
Range("B" & RW).Resize(, 3).Copy
Range("A" & RW + 1).PasteSpecial xlPasteValues, Transpose:=True
Next RW
Range("B:D").Delete xlShiftToLeft
Application.ScreenUpdating = True
End Sub
How/Where to install the macro:
1. Open up your workbook
2. Get into VB Editor (Press Alt+F11)
3. Insert a new module (Insert > Module)
4. Copy and Paste in your code (given above)
5. Get out of VBA (Press Alt+Q)
6. Save as a macro-enabled workbook (.xlsm)
The macro is installed and ready to use. Press Alt-F8 and select it from the macro list.
Bookmarks