how to keep business and personal contacts seperate?

[robble]

I have well over 100 phone numbers in my contacts with half being personal friends and the rest being business. I could actually have hundreds in there for business but They are mixed up with personal now and the book is already too unwieldy.

What can I do to have two separate contact lists, one for friends and one for business? I'd like incoming caller ID tags to work on everybody. Most of the time outgoing calls would be to friends and that is the contact list I'd want to see when I hit the phone button with the option of calling up the other list.

When I call up the phone book in my car (via the cars built in bluetooth) I'd only want to see the friends list.

Now I do have a favorites list but I want to keep that down to about 10 names.

[xtremecanefan]

I am not sure how groups work but you might be able to use that to separate them.