the short answer is that each buy / sell if not at the same price will need to be documented on the worksheet seperately. Any that were held longer than 366 days are at 15% ( currently, this may change ).....
I think I know what you are asking. If you have made multiple purchases of ERHE all more than a year old you can just write them all in on one line on your tax return and put the purchase date in as 'various', then the total amount.
you must use "specific identification" so some of the shares will be taxed at the long term capital gains rate and the remainder will be taxed at whatever tax bracket you happen to be in in the year of sale.