Add Sub-Allocate IP Pool to Edge Gateway

How can I do it.

I would like to set it up like this: http://i.imgur.com/P1M7i90.png

I set Sub-Allocation in this way:

$subAllocationType = new VMware_VCloud_API_SubAllocationType();
$subAllocationType->setEdgeGateway($edgeGatewayRef);                     
$subAllocationipRange = new VMware_VCloud_API_IpRangeType();
$subAllocationipRange->setStartAddress('77.79.240.136');
$subAllocationipRange->setEndAddress('77.79.240.136');

$subAllocationipRanges = new VMware_VCloud_API_IpRangesType();
$subAllocationipRanges->setIpRange(array($subAllocationipRange));

$subAllocationType->setIpRanges($subAllocationipRanges);
$subAllocations = new VMware_VCloud_API_SubAllocationsType();

$subAllocations->setSubAllocation($subAllocationType);

How to save the Sub-Allocate IP Pool to Edge Gateway?