For editing Conditional Formatting of an Excel Workbook, follow following steps. It is different for Excel 2003 and 2007. So we will see the steps for both Excel 2003 and 2007.

Excel 2007 || Excel 2003


Excel 2007:

a) When you know the cell or cell range where that formatting is…

Step 1. Select the Cell or Cell Range where the conditional formatting is there and you want to edit.

Step 2. Go to Home –> Conditional Formatting –> manage Rules

Conditional-formatting

Step 2. Here you can edit or delete the Formatting
Conditional-formatting

b) When you Do NOT know the cell or cell range where that formatting is…

Step 1. Go to Home –> Conditional Formatting –> manage Rules
Step 2. Here select the Sheet Name or Worksheet from the Drop down
Conditional-formatting

Step 3. This will list down all the conditional Formatting done in that particular Sheet or Workbook.

Conditional-formatting

Step 4. Now Select the particular formatting which you want to edit and click in Edit

Conditional-formatting

Excel 2003:

In Excel 2003, there is no drop down to list down all the conditional formatting in Sheet or workbook. Excel 2003 list down only those conditional formatting which are there in the selected range.
So if you want list down all the conditional formatting done in a sheet then select whole sheet and follow the following steps:

Step 1. Select the Cell or Whole Sheet

Step 2. Go to Format –> Conditional Formatting
Step 3. Now you can edit or Delete the Conditional Formatting for your desired Cell or Cell Range

Conditional-formatting

 
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