Hi, I have a report that I must run every day. So every time I generate it, Jasperserver compute the data of previous days (already calculated the last time report was generated) and add new informations for the current date in an other column. My question is, can I make a report that already generated (yesterday) and generate only new information and merge the 2 documents ? Example : Yesterday report : monday tuesday wednesday thursday friday saturday sunday 6 5 6 0 0 0 0 New report : monday tuesday wednesday thursday friday saturday sunday 6 5 6 2 0 0 0 I want to do that for performance reason. Thank you