Transfer money between projects
From Moneytrackin' help

The amount has to be positive (enter first the account to substract money and least the account to add money).
If the target project is on a different currency the amount will be converted automatically using the latest exchange rate (we update it every 6 hours for all supported currencies).
Finally if all the entered values are correct and the transfer has finished successfully there will appear a new transaction on the source and target projects (one substracting money and the other adding the money to destination).
If you want to do a periodically transfer you can do so creating two periodic transactions (one substracting money to one account and the other adding the money to the destination account like transfer does).