If you started with a colorless solution of some volume and some unknown molarity of HCl, and the typical indicator phenolpthalein, and you titrated with a known volume and molarity of NaOH to the appearance of a pink endpoint, you'd know exactly what the endpoint was, and what calculations to do.
I just wrote that to let you know the assumptions we have to make, because you weren't as clear.
If you've overshot with the NaOH, and can't just start over, then you can add a known volume of more HCl, until clear, and titrate again to the endpoint. In which case, its as if you simply started with more HCl solution -- the sum of your two solutions.
Are you doing something like that?