We simply configure pulledpork to download and enable rules.
So, rules selection has to be configured in pulledpork.conf and related files (disablesid.conf, dropsid.conf, enablesid.conf, modifysid.conf) according to pulledpork syntax.
To identify rules category, we could use the filename inside the tar.gz:
# tar -ztvf /tmp/emerging.rules.tar.gz | head
drwxr-xr-x root/root 0 2016-03-06 21:20 rules/
-rw-r--r-- root/root 13710 2016-03-06 21:20 rules/emerging-snmp.rules
-rw-r--r-- root/root 8660 2016-03-06 21:20 rules/emerging-icmp.rules
-rw-r--r-- root/root 28423 2016-03-06 21:20 rules/emerging-user_agents.rules
-rw-r--r-- root/root 1934 2016-03-06 21:20 rules/emerging-rbn.rules
-rw-r--r-- root/root 3349 2016-03-06 21:20 rules/emerging.conf
-rw-r--r-- root/root 2870968 2016-03-06 21:20 rules/emerging-web_specific_apps.rules
-rw-r--r-- root/root 26775 2016-03-06 21:20 rules/emerging-botcc.portgrouped.rules
-rw-r--r-- root/root 10027 2016-03-06 21:20 rules/emerging-inappropriate.rules
-rw-r--r-- root/root 298952 2016-03-06 21:20 rules/emerging-activex.rules