root = moneydance.getCurrentAccount()
book = moneydance.getCurrentAccountBook()

## Change the account names in the following two lines!
## The transactions in fromAccount will be moved to toAccount
## if both accounts already exist
fromAccount = root.getAccountByName("Automotive:Fuel")
toAccount = root.getAccountByName("Automotive:Misc")

print "moving transactions from %s to %s" % (fromAccount, toAccount)
if fromAccount and toAccount:
  print "moving now"
  txns = book.getTransactionSet().getTransactionsForAccount(fromAccount)
  for txn in txns.iterator():
    txn.setAccount(toAccount)
    txn.getParentTxn().syncItem()