Re Lighting and Sockets from existing Power Supply

Basically this is a small office area on the ground floor of a structure which needs 6 13 A sockets one either side of the structure.There is an existing power supply that supples 110,230 and 400v to each floors but no power cable connection to the office area. So was wondering would I need to route a new cable (ie 16mm2 cable) from the existing 230v power supply than via 63A RCD and 32A MCB then from the 32A MCB cable a 2.5mm2 cable to the relevant sockets in order for them to get power to them. Also for lighting would the same apply here but using 1.5mm2 cable from a 6A MCB to light up 12 Sealed Strip lights.Now which is better to switch all lights on with one switch to all floors or to switch on each floor separately?. Would that mean either a Parallel or Series type circuit?Jimmy2Rivers