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How to increase a particular terms's weightage?

I am doing classification using LibSVM in Rapid Miner. I am using TFIDF values for processing documents. I need to Increase weightage of some terms in the documents(for eg. words in BOLD and CAPITAL letters). How can I achieve that using TFIDF values? If TFIDF is not the correct way, Can anyone suggest some ways to achieve the result.

Thanks in advance

Sunil