I added an item to the template Template_Linux. Then I exported the template and imported it into another Zabbix server. The template was associated with three hosts including Zabbix server. The item I added was in the Application "Processes". After I imported the template, I looked at the item in the three hosts, and only in Zabbix server was the item associated with Processes. In the other two hosts, the item wasn't grouped into any application (it was None in the Applications selection box). I had to manually change it to Processes.

Here is the information of the item in the exported template:

<item type="0" key="proc.num[ntpd]" value_type="3">
<description>Number of running processes $1</description>
<ipmi_sensor></ipmi_sensor>
<delay>60</delay>
<history>7</history>
<trends>365</trends>
<status>0</status>
<data_type>0</data_type>
<units></units>
<multiplier>0</multiplier>
<delta>0</delta>
<formula>0</formula>
<lastlogsize>0</lastlogsize>
<logtimefmt></logtimefmt>
<delay_flex></delay_flex>
<authtype>0</authtype>
<username></username>
<password></password>
<publickey></publickey>
<privatekey></privatekey>
<params></params>
<trapper_hosts>localhost</trapper_hosts>
<snmp_community></snmp_community>
<snmp_oid></snmp_oid>
<snmp_port>161</snmp_port>
<snmpv3_securityname></snmpv3_securityname>
<snmpv3_securitylevel>0</snmpv3_securitylevel>
<snmpv3_authpassphrase></snmpv3_authpassphrase>
<snmpv3_privpassphrase></snmpv3_privpassphrase>
<applications>
<application>Processes</application>
</applications>
</item>

I imported the template with the default options except that I chose not to update existing triggers.

Thanks.