At this point you can't "restore" it. You can only transfer information from the previous year's income tax return when you first start on this year's income tax return.
If I'd done this using "desktop" TurboTax, and I hadn't yet saved the file after the remove, I'd close the file, making sure I didn't "save" it, and then open the file when it was last saved. That would leave the transferred information intact. Maybe there's some similar process you can follow in the "online" version?
Tom Young
