The multi masternode config allows to control multiple masternodes from a single wallet. The wallet needs to have a valid collaral output of 1000 coins for each masternode. To use this, place a file named masternode.conf in the data directory of your install:
The new masternode.conf format consists of a space seperated text file. Each line consisting of an alias, IP address followed by port, masternode private key, collateral output transaction id and collateral output index.