yes its bettery to do one for each service here is the example of the commands if u were to add port 80 for a web server and if you named your interfaces inside and outside respectively:
object network HTTPSERVER
host 192.1.50.60
nat (inside,outside) static interface service tcp 80 80
object network INSIDE
nat (inside,outside) dynamic interface
object network HTTPSERVER
nat (inside,outside) static interface service tcp 80 80
access-list Outside_access_in extended permit tcp any object HTTPERVER eq 80
access-group Outside_access_in in interface Outside
here is another example of the commands if u were to add port 80 for a web server and if you named your interfaces inside and outside respectively:
object network PCPORT233
host 192.1.50.50
nat (inside,outside) static interface service tcp 233 233
object network INSIDE
nat (inside,outside) dynamic interface
object network PCPORT233
nat (inside,outside) static interface service tcp 233 233
access-list Outside_access_in extended permit tcp any object PCPORT233 eq 233
access-group Outside_access_in in interface Outside