It is possible, but you have to explain the required volts/amps for each output.
Also if the common (ground) return must be isolated from each other or not.
What I would do, is keep the 30 volt output as is. You can add a voltmeter and ammeter, there are plenty of offerings in Ebay, both analog and digital.
Then, with a switchmode power supply, I would convert the 30 volt to 5 volt for the USB. By the nature of your question I would not advocate that you design and build it yourself. Again, I would look at what Ebay has to offer. You will be able to buy fully assembled functional switchmode supplies for far less than the cost of the individual components.