Hello Ait Support,
To simplify tagging on EXOS the native vlan is the untagged vlan. If you are adding more then one vlan to a port then it is considered a trunk port. Only one vlan can be added to a port as untagged. The equivalent configuration would be this:
switchport trunk native vlan [MAN_vlan]
switchport trunk allowed vlan [list of the vlans whose traffics will be enabled on this port] \
to:
configure vlan MAN_vlan add port untagged
configure VLAN [list of the VLANs whose traffics will be enabled on this port] add port tagged
Continue the second command until the port has been added into each VLAN individually. On some newer versions of EXOS you can put in a VLAN id list using the tag given to that VLAN
Hope this helps!