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If you want the CC to come off and if it was a charge-off, then you can negotiate a PFD asking them to remove the entire account in exchange for payment. Per your FICO score, it doesn't matter if you offer 100% or a lesser amount...the TL would come off.
If you don't want it off because it is helping your history, score, etc., then paying anything less than 100% could result in a remark being placed within the comments listed as "settled" or "settled for a lesser amount owed" or something like that. FICO will still read that account as a bad account on par with a charge-off. You could always offer a GW letter to the lender at a later date to get that remark removed. Or you can alter your PFD to not remove the account, but rather remove the lates or CO reference.
What you were referring to was a PFD.
For more info, check these out:
Common AbbreviationsCredit Scoring 101 - great for knowing what is in your credit score and to see how your score is impacted.
and
What Steps Do I Take - great for learning the repair process.