RB951-2n - tagged and untagged vlans on same eth port

Here my situation/idea.

eth1 is my gateway
got tagged vlans from CPE/switch on uplink

i would like to have on one port one untagged and one or more tagged vlans. The device connected on that port can work with tagged and untagged vlans.


Can you help? I tried with bridging and switching, but no success.