You still can and should enter the different dates for the donated items at the Goodwill site. You need to click on "Add Item Donation," choose your charity (Goodwill) from your drop down menu, and enter the first donation date. Add the items to your donation and click "Done" and then repeat this step for the next donation dates. Since you must have the receipts for the four dates you donated the items, it is best to enter the dates individually, just as you remembered was done in the past. If you have already entered all your items in one donation date, you will want to edit it to reflect the first date's items donated and remove those items from the subsequent date. Then enter the next three donation dates and items. Good luck.