Sounds like a job for an electrical engineer...
Assuming the "110 devices" are single phase, you have 6600VA of load (110 x 20 x 3). I would normally provide a 480 to 120/240V 1-phase transformer - about 10kVA assuming you don't want to allow for future loads, a 2-pole circuit breaker in the 460 panel to feed the transformer and a 120/240V 1-phase, 3-wire panel with a 2-pole main breaker and branch breakers for your loads. Circuit breakers and wire must be sized per local codes. The transformer neutral must be grounded per local code as well.