VBA .Find and .Union Method - vba

Question

I'm new to VBA. I want to find the headers of six columns and join them using the union method. Once they are joined as BigColumns, I want to change the font size to 14.
I've already tried looping, but given that I am new to this I wanted to try a simpler way. I can successfully run this code on one range, such as TC1, and change the font to 14. But as soon as I try combining ranges, it fails.
Sub ASOLDPrintFormatTesting2()
Dim Table As Range
Dim BigColumns As Range
Dim TC1, TC2, TC3, TC4, TC5, TC6 As Range
'TC stands for Table Columns These individual ranges are joined through
Union Method
Set ReferenceCell = ActiveCell
Set WS = Sheets(2)
With WS
Set ReferenceCell = Cells.Find(What:="Source #", LookIn:=xlFormulas, _
LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
MatchCase:=False, SearchFormat:=False)
'Make Source # the Reference Cell, or the equivalent of A1
If Not ReferenceCell Is Nothing Then
Set ReferenceCell = Cells.Find(What:="Sample #", LookIn:=xlFormulas, _
LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
MatchCase:=False, SearchFormat:=False)
End If
'Make Sample # the Reference Cell
Set Table = ReferenceCell.CurrentRegion
With Table
Set TC1 = .Find(What:="Source Well", LookIn:=xlFormulas, _
LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
MatchCase:=False, SearchFormat:=False)
Set TC2 = .Find(What:="Sample ID", LookIn:=xlFormulas, _
LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
MatchCase:=False, SearchFormat:=False)
Set TC3 = .Find(What:="VerboseConc_uM", LookIn:=xlFormulas, _
LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
MatchCase:=False, SearchFormat:=False)
Set TC4 = .Find(What:="VerboseConc_ug/ml", LookIn:=xlFormulas, _
LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
MatchCase:=False, SearchFormat:=False)
Set TC5 = .Find(What:="Mol Wt.", LookIn:=xlFormulas, _
LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
MatchCase:=False, SearchFormat:=False)
Set TC6 = .Find(What:="N/Mole", LookIn:=xlFormulas, _
LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, _
MatchCase:=False, SearchFormat:=False)
'Find all headers of BigColumns
Set BigColumns = Application.Union(Range("TC1"), Range("TC2"), _
Range("TC3"), Range("TC4"), Range("TC5"), Range("TC6"))
'Union of all headerrs as BigColumns
If Not BigColumns Is Nothing Then
Else
MsgBox "'BigColumns' not found"
Exit Sub
End If
End With
With BigColumns
.Cells.Font.Size = 14
End With
'Test to see if BigColumns works
End With
End Sub
No error messages are produced when the code runs.

Answer 1

Using an array (will give a snippit example), you should be able to loop and save some time and possible issues where things are not found:
dim arr as variant, i as long
arr = array("Source Well","Sample ID") 'can add more
with table
for i = lbound(arr) to ubound(arr)
set f = .find(what:=arr(i))
if not f is nothing then f.font.size = 14
next i
end with
-untested code-
You find your item, if it's not found it skips changing the font size.