NAME TO IP FORWARDING

Hello,

How to possible my local network user type in browser “nas-server” then Mikrotik forward to ip 192.168.1.20

Yes,
You use a static DNS record or set up Hairpin NAT.
Hairpin NAT is not recommended.

Can you give me example of static DNS
I will write nas-server in browser then forward to 192.168.1.20

https://wiki.mikrotik.com/wiki/Manual:IP/DNS

Not sure if this will work but.

/ip dns static
add address=192.168.1.20 regexp=^nas-server$