should be:
unset address "Trust" "192.168.0.0/24" 192.168.0.0 255.255.255.0
set address "Trust" "192.168.100.0/24" 192.168.100.0 255.255.255.0
unset policy id 7
set policy id 7 name "VPN_Client_Inbound" from "Untrust" to "Trust" "Dial-Up VPN" "192.168.100.0/24" "ANY" tunnel vpn "VPN_Client_Tunnel" id 0x3 log
set policy id 7
set log session-init
Billy