Merging public ang guest network

[Anton Rubets]

Hi all.
I have some problem with understanding networking. Now i need to somehow
merge public and guest network. So i explain.
Cloudstack located in real NAT network, and we dedicated vlan for virtual
machines, so i want to give them ip in our network via dhcp or manually.
Can i realize it somehow, for example via network  or network offerings.
Thx