Help with creating a management plugin in OEM.

Hi Everyone ,
I was trying to create a management plugin - which would monitor a WLS instance.
So we created a plugin using the emjmxcli tool , and it worked fine.
Background info :
WLS side - managed server running - has 2 channels HTTP/ HTTPS - and 2 virtual hosts created : one for each channel. Applications are deployed into this virtual hosts.
EM side - after creating a target of the particular type (from management plugin) , drilling down into the metrics gives different attributes
eg : "com.bea:Name=Default[http],ServerRuntime=ManagedServer_1,Type=ServerChannelRuntime" ------ where ServerChannelRuntime = mbean i am monitoring.
Among these , there are 2 attributes , one for each Channel which i specified earlier.
Now the issue is - I need to modify the plugin target/collection xmls so to SUM up these 2 attributes (HTTP and HTTPS) , and filter out all other attributes which are shown. It takes up unnecessary space in db as well.
So i tried - adding an <executiondescriptor> -
<ExecutionDescriptor>
<GetTable NAME="Metric" USE_CACHE="TRUE_IF_COLLECT"/>
    <GetView NAME="ChannelHTTP" FROM_TABLE="Metric">
        <Filter COLUMN_NAME="ObjectName" OPERATOR="EQ">com.bea:Name=Channel_HTTP_1,ServerRuntime=ManagedServer_1,Type=ServerChannelRuntime</Filter>
    </GetView>
   <GetView NAME="ChannelHTTPS" FROM_TABLE="Metric">
        <Filter COLUMN_NAME="ObjectName" OPERATOR="EQ">com.bea:Name=Channel_HTTPS_1,ServerRuntime=ManagedServer_1,Type=ServerChannelRuntime</Filter>
    </GetView>
   <JoinTables NAME="BothChannels" >
        <Table NAME="ChannelHTTP"/>
        <Table NAME="ChannelHTTPS"/>
    </JoinTables>
    <GroupBy NAME="result" FROM_TABLE="BothChannels">
        <AggregateColumn NAME="NumberOfReq" COLUMN_NAME = "NumberOfReq" OPERATOR="SUM" />
     </GroupBy>
</ExecutionDescriptor>But this didnt help. So if any one could help out with this , it would be great.
I need to -
1. Sum up 2 attributes.
2. Filter out other attributes which appear automatically from the mbean.
Thanks

I found a great tutorial here:
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