Is there an option on Facebook to prevent some of the people ,that I already am friend with,from watching who all my other fb friends are?and if yes how can I enable it? Thank you

Privacy Settings > Profile Information

Did you click on "Customize"?

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Originally Posted by NeedKarma

Privacy Settings > Profile Information

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I don't mean to hide everything just the rest of my friends

With the Customize feature you can select who does not get to see the type of info you selected.

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Originally Posted by NeedKarma

With the Customize feature you can select who does not get to see the type of info you selected.

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where exactly is the friend option so I can customize it?

I just re-read your question, I'm sorry I misunderstoof what you were asking.
It looks like you cannot stop friends from seeing your list of friends in this new Facebook and some people are mad about it: how do you stop people seeing your friends on VIEW FRIENDS??????? | Facebook

Try this: Now, Facebook Lets Users Hide Friends From People Who Are Not Logged In