From what I can tell, the only way to effectively do an archive is to open a new account -- pick the day you want to start "as of", then place the opening balance that the account had as of that date. Then copy over the transactions into the new account. The "old" account would have all transaction before the "as of" date, and the "new" account would have all the transaction after the as of date. It's a lot of work. An archive function would be so much nicer. That way, I could get rid of transactions that are over 10 years and place them in a "archive transactions" account.