If you want parentheses around 'Rupees ' and the mergefield, with ' only' before the closing bracket, then add the text to your mailmerge main document - this is basic text entry and has nothing to do with mailmerge. I have no idea what you mean about a 'huge gap' - there is only a single space between each word pair.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]