If you are referring to Google Chrome's website history, press Crtl+H to bring up your history. There are checkboxes next to each link. Select what you want to remove and click the "Remove selected items" button at the top of the page.
In my opinion, the best thing to do is clear your entire browsing data and start fresh. This way you will be sure all old data has been removed from your browser.
Chrome plugin called Click&Clean may be what you are looking for. I have not used it, so I am unable to vouch for it. There is a section where you can select cookies to keep and cookies to delete.