This macro will do it...
How/Where to install the macro:
1. Open up your workbook
2. Get into VB Editor (Press Alt+F11)
3. Insert a new module (Insert > Module)
4. Copy and Paste in your code (given above)
5. Edit the MyStr text to be what you want
6. Get out of VBA (Press Alt+Q)
7. Save as a macro-enabled workbook
The macro is installed and ready to use.
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How to use the macro:
1) Select the cells you want to edit, or some of them.
2) Press Alt-F8 and select AddText from the macro list.
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