I made a couple of assumptions for test purposes.
I put a sheet called "Company Names" in the current sheet and populated it
with ID and Company Names.
If you put it in another workbook, just change the "Thisworkbook.Name" to the
appropriate name (and the sheet name "Company Names" to the appropriate one).

I also made use of the Worksheet Change event to watch for changes to column 1
(you can use another column by changing the value of Col_CompID)
Also, I duplicated the code to allow for copying multiple lines.
Normally, I would have written this as a function and passed the
target address to the function.

do you know where to put this change event? (it goes in the sheet module, not a 
"standard" module)

(watch for line breaks when this is posted)

hope this helps:

paul
'====================================================================

Option Explicit
Private Sub Worksheet_Change(ByVal Target As Range)
    Dim CompCnt, DataRange, Data, CompName, i, Col_CompID
    On Error Resume Next
    Col_CompID = 1
    If Target.Count = 1 Then
        If Target.Column = Col_CompID Then
            Range(Target.Address).ClearComments
            If (Target.Value <> "") Then
                CompName = ""
                CompCnt = 
Application.WorksheetFunction.CountA(Workbooks(ThisWorkbook.Name).Sheets("CompanyNames").Range("A1:A65000"))
                Set DataRange = 
Workbooks(ThisWorkbook.Name).Sheets("CompanyNames").Range("A2:A" & CompCnt)
                For Each Data In DataRange.Columns(1).Cells
                    If (UCase(Data.Value) = UCase(Target.Value)) Then
                        CompName = 
Workbooks(ThisWorkbook.Name).Sheets("CompanyNames").Cells(Data.Row, 2)
                        Exit For
                    End If
                Next Data
                If (CompName <> "") Then
                    Range(Target.Address).AddComment
                    Range(Target.Address).Comment.Visible = False
                    Range(Target.Address).Comment.Text Text:=CompName
                End If
            End If
        End If
    Else '  if multiple lines are added
        For i = 1 To Target.Count
            If Target(i).Column = Col_CompID Then
                Range(Target(i).Address).ClearComments
                If (Target(i).Value <> "") Then
                    CompName = ""
                    CompCnt = 
Application.WorksheetFunction.CountA(Workbooks(ThisWorkbook.Name).Sheets("CompanyNames").Range("A1:A65000"))
                    Set DataRange = 
Workbooks(ThisWorkbook.Name).Sheets("CompanyNames").Range("A2:A" & CompCnt)
                    For Each Data In DataRange.Columns(1).Cells
                        If (UCase(Data.Value) = UCase(Target(i).Value)) Then
                            CompName = 
Workbooks(ThisWorkbook.Name).Sheets("CompanyNames").Cells(Data.Row, 2)
                            Exit For
                        End If
                    Next Data
                    If (CompName <> "") Then
                        Range(Target(i).Address).AddComment
                        Range(Target(i).Address).Comment.Visible = False
                        Range(Target(i).Address).Comment.Text Text:=CompName
                    End If
                End If
            End If
        Next i
    End If
    On Error GoTo 0
End Sub


 



________________________________
From: Dave <davidstev...@gmail.com>
To: MS EXCEL AND VBA MACROS <excel-macros@googlegroups.com>
Sent: Wednesday, May 27, 2009 6:28:41 PM
Subject: $$Excel-Macros$$ A Macro needed for the task beow


Hi,

I have a spreadsheet that contains a company code in cell A3 to A150.
This company code uniquely identifies a company. These codes ones
assigned are not transferred to another company. What I want to do is
when a user clicks in a cell with the company code I want to reference
its company name. This way the user is not running around looking up
company names that are stored an another excel file . The company
codes are as follows:

0010-BBBB
0010-CCCC
0013-0000
0015-0100
0041-WOKS

So if a user clicks on cell a1 containing 0010-BBBB I want to return
Big Bass Outfitters and if they click in the cell contusing 0010-CCCC
I want to display Canada Water and so on and so forth

I was thinking about a macro some how adding automatic comments by
looking up the company codes against the company name and inserting
comments. But I am not sure if its a good solution and if it can be
done.

All suggestions are welcome.

Please reply here or reply to may email,

thanks,

Dave


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