Is it possible to set VLANs on PPPoE?

Hi all

I have a 450G which I use as a VPN server. I ve setup PPPoE with 3 users, all using static IPs. Is it possible to set two of these users to be only capable of pinging and connecting to two internal hosts instead of all the network?

thanks

Firewall filter
drop src-ip X.X.X.X to dst IP Not x.x.x.x or x.x.x.x