Yes you can
example:
vlan 21 client
ip address 172.20.220.2 255.255.255.0
gateway 172.20.220.1
!
vlan 20 server
ip address 172.20.220.2 255.255.255.0
!
natpool OUTGOINGNAT 172.20.220.99 172.20.220.99 netmask 255.255.255.0
!
serverfarm xyz
no nat server
nat client OUTGOINGNAT
predictor forward
!
vserver OUTGOING
virtual 0.0.0.0 0.0.0.0 any
vlan 20
serverfarm xyx
persistent rebalance
inservice
Syed