Different trigger per host group

[natalia]

Hi,

on Template OS Linux I have trigger "Memory utilization on server is > 98 for 4 mins on {HOST.NAME}" :

({TRIGGER.VALUE}=0 & {Template OS Linux:vm.memory.size[pavailable].max(4m)}<2) | ({TRIGGER.VALUE}=1 & {Template OS Linux:vm.memory.size[pavailable].max(4m)}<5)

For the App servers (I have "Template App servers" ) I want to define another trigger ">90" : vm.memory.size[pavailable].max(2m)}<10

The servers assign to "Template App servers" also assign to "Template OS Linux" as well.
How to implement this ?

zabbix server 2.0.5 (agents 2.0.6)

Thanks for the help !