I think this is what you are looking for. It copies data from worksheets and gets the sheet names split as asked. I have it hard coded to only work for double digit numbers and single letters. Do you have sheets that do not fit that form? If so, I can rework my code!
ORIGINAL:
Sub SheetSummary()
'Make new worksheet with required headers
ActiveWorkbook.Sheets.Add
ActiveSheet.name = "Summary"
range("A1").Value = "subject"
range("B1").Value = "condition"
range("C1").Value = "ingredient"
range("D1").Value = "value"
Dim ws As Worksheet
Dim wsNum As String
Dim wsLetter As String
Dim wsLastRow As Long
Dim sumLastRow As Long
Dim myCell As range
Dim nextOpenRow As Long
'If a worksheet is not the summary, then get the data
For Each ws In Worksheets
If ws.name <> "Summary" Then
wsNum = Left(ws.name, 2)
wsLetter = Right(ws.name, 1)
wsLastRow = ws.Cells(Rows.count, "A").End(xlUp).Row
nextOpenRow = Cells(Rows.count, "A").End(xlUp).Row + 1
ws.range("A2", ws.Cells(wsLastRow, "A")).Copy
range("C" & nextOpenRow).PasteSpecial xlPasteAll
lastRow = Cells(Rows.count, "C").End(xlUp).Row
ws.range("C2", ws.Cells(wsLastRow, "C")).Copy
range("D" & nextOpenRow).PasteSpecial xlPasteAll
Application.CutCopyMode = False
For Each myCell In range("A2", Cells(lastRow, "A"))
If myCell.Value = "" Then
myCell.Value = wsNum
End If
Next myCell
For Each myCell In range("B2", Cells(lastRow, "B"))
If myCell.Value = "" Then
myCell.Value = wsLetter
End If
Next myCell
End If
Next ws
End Sub
EDIT:
Sub SheetSummary()
'Make new worksheet with required headers
ActiveWorkbook.Sheets.Add
ActiveSheet.name = "Summary"
range("A1").Value = "subject"
range("B1").Value = "condition"
range("C1").Value = "ingredient"
range("D1").Value = "value"
Dim ws As Worksheet
Dim wsNum As String
Dim wsLetter As String
Dim wsLastRow As Long
Dim sumLastRow As Long
Dim myCell As range
Dim nextOpenRow As Long
'If a worksheet is not the summary, then get the data
For Each ws In Worksheets
If ws.name <> "Summary" Then
wsNum = Left(ws.name, 2)
wsLetter = Right(ws.name, 1)
wsLastRow = ws.Cells(Rows.count, "A").End(xlUp).Row
nextOpenRow = Cells(Rows.count, "A").End(xlUp).Row + 1
ws.range("A2:A27").Copy
range("C" & nextOpenRow).PasteSpecial xlPasteAll
lastRow = Cells(Rows.count, "C").End(xlUp).Row
ws.range("D2:D27").Copy
range("D" & nextOpenRow).PasteSpecial xlPasteAll
Application.CutCopyMode = False
For Each myCell In range("A2", Cells(lastRow, "A"))
If myCell.Value = "" Then
myCell.Value = wsNum
End If
Next myCell
For Each myCell In range("B2", Cells(lastRow, "B"))
If myCell.Value = "" Then
myCell.Value = wsLetter
End If
Next myCell
End If
Next ws
End Sub