port makeall

is a quick way to turn all labels into ports. Use with caution, as you might have labels that you don't want to be ports.

The most convenient way to create ports, though, is to use the

readspice

command with a valid netlist. That command will parse the netlist and compare all labels against ports of the

.subckt

matching the cell name, and create ports accordingly, indexed to match the port order of the netlist. If you happen to have a LEF view of the cell, you can read that with

lef read

and it will further annotate the ports with class and direction taken from the LEF view (although LEF files do not indicate a port order).