Vlan stacking example

can anyone share a configuration example of an OS 9 switch (S2048-ON) doing vlan stacking? My provider is sending me a stacked traffic stream at one end but the other end is just an ordinary layer 2 trunk. At that other end I have untagged traffic and one vlan (2000) I desperately need to communicate on.  I'm not so concerned about the untagged traffic but if that was all I could get working that would do.
Its a service that is being migrated (from another org) to a new location (me) and the new location is seeing the original traffic wrapped in vlan 1234. I have tried reading the config guide and I can make a port stack compatible but I don't understand how I declare one vlan as the wrapper and others as the inside customer vlan. I want to bring the inside vlan 2000 out onto the switch and give it normal vlan functions like an IP address