Hi jcc012,
Thanks for your post, and we're sorry for the delayed response.
As per checking, adding a column with YTD from previous financial years is not an option in Profit and Loss Statement. You may check the Help Articles: Customising reports and Add and remove report columns to know what are the only details you can edit with your reports.
Feel free to post again anytime you require further assistance.
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Best regards,
Doreen