If that other cell is bolded by formatting (not conditional formatting), then
you could use userdefined function.
Option Explicit
Function IsBold(rng As Range) As Boolean
Application.Volatile
Dim ChkBold As Variant
Set rng = rng.Cells(1)
ChkBold = rng.Font.Bold
IsBold = False
If ChkBold = True Then
IsBold = True
End If
End Function
And changing the format of the cell won't change the results of this formula.
You'll have to force a recalc before you can trust the results.
If you're new to macros:
Debra Dalgleish has some notes how to implement macros here:
http://www.contextures.com/xlvba01.html
David McRitchie has an intro to macros:
http://www.mvps.org/dmcritchie/excel/getstarted.htm
Ron de Bruin's intro to macros:
http://www.rondebruin.nl/code.htm
(General, Regular and Standard modules all describe the same thing.)
========
Short course:
Open your workbook.
Hit alt-f11 to get to the VBE (where macros/UDF's live)
hit ctrl-R to view the project explorer
Find your workbook.
should look like: VBAProject (yourfilename.xls)
right click on the project name
Insert, then Module
You should see the code window pop up on the right hand side
Paste the code in there.
Now go back to excel.
Into a test cell and type:
=IsBold(a1)
Where A1 contains the value to check.
===========
Now you can use this UDF in your Conditional formatting formula is rule:
=isbold(a1)
(if you're checking A1)