Dear friends,
please assist me how to map IPV4 mapping with IPV6 and vice versa in MT.
What do you mean by mapp?
There are tunnel interfaces - 6to4 which encapsulates IPv6 packets for transport across an IPv4-only network, and ipipv6 which encapsulates IPv4 packets for transport across an IPv6-only network.
It is impossible for IPv4 clients to access IPv6 hosts.
There are transition mechanisms for IPv6 clients to access IPv4 hosts, and IPv4 clients communicate over IPv6-only networks built on top of tunnels, see https://en.wikipedia.org/wiki/IPv6_transition_mechanism. Mikrotiks can mostly support the client end of Dual-Stack Lite but do not implement NAT64 for the provider end, or other mechanisms such as Lw4o6 and 464XLAT.