Here are the steps
Click Start -> Run -> Type eudcedit.exe
Private character editor will get opened
Select the first empty code as shown above
Click OK
Click Edit menu -> Copy Character
Change the font by clicking on Font Button and set desired font (I selected Georgia).
Click OK
Select Letter 'R'
Click OK
Modify the letter by using tool like pencil, rectangular selection etc
Now we can link this symbol to existing fonts
Using the Rupee Symbol into a text The characters for private use are accessible via the "Character Map".
To insert Rupee Symbol into a text:
This Symbol will work only on the machine, it was created, unless you save it into a separate font-file and distribute it together with your document.
That's it.
http://mscoder.wordpress.com/2010/07/18/how-to-type-indian-rupee-symbol-in-text/