Ok, here is my update based on code from below. What I need is to have any data from any sheet listed in 'Master' to fill in sheet 'Combined'. I will only have three columns of data in each sheet. Data from each sheet should start in Column A of 'Combined'.
Private Sub CommandButton1_Click()
Dim lLastRow As Long
Dim i As Integer
lLastRow = Worksheets("Master").Cells(Rows.Count, 1).End(xlUp).Row
last_col = 0
For i = 2 To lLastRow
MySheet = Worksheets("Master").Cells(i, 1).Value
Worksheets(MySheet).Columns(1).Copy Worksheets("Combined").Columns(last_col + 1)
last_col = Worksheets("Combined").Cells(1, Columns.Count).End(xlToLeft).Column
Next
End Sub