Thanks for your response.

The above link gives an option to get the setting. But I also need the piece to update the setting value programmatically. 
Since it's a list of object and a serial object . i am not finding to set and Save them using ObjectScript. 
Any help will be appreciated.

Thanks for the immediate response Kuroz,
It's going to help me a lot for the 2nd and 3rd points. 

I will just wait for the Individual Rule deleting piece now.
Thanks,

Purushothaman.T

Hi Kevin,
Yes, FindSettingsByName method is giving empty for some items. 
They are showing Green color in the mgmt portal. I also couldnt find them in the Settings value of Ens_Config.Item table.  It gives only few settings values. E.g below

It's a custom Operation class (extends EnsLib.HL7.Operation.TCPOperation) in which the Alert properties are overridden.
It's not working for a host which has class name of EnsLib.HL7.Operation.FileOperation , but it works for EnsLib.HL7.Operation.HTTPOperation, since it shows those settings in Ens_Config.Item table.
I need to find out, what are the cases, in which the Alert Settings are not showing in the Ens_Config.Item table.
Appreciate any help. We can connect directly, if you want. Let me know your availability through email.

In the Ens_Config.Item table, For the same underlying custom TCP operation class, I see one entry has these Alert Settings and other doesnt have all of the Alert Settings.
I am not sure, what's the reason behind this .

I could see the reason behind this. 
Whatever setting present in the Production class Xdata block, those only available in the Ens_Config.Item table->Settings column
So the real question now is, How do I Update the settings, which are not present in the Production Class/Ens_Config.Item, but showing as a setting for the Business Host in management Portal through a piece of code.
E.g
Production XData block

 <Item Name="OPR_ALL_SMM_MLA" Category="SMM_ADT,SMM_ORM" ClassName="SJHLIB.Operation.HL7.TCPOperation" PoolSize="1" Enabled="true" Foreground="false" Comment="" LogTraceEvents="false" Schedule="">
    <Setting Target="Host" Name="LoggingTarget">OPR_LOG_SOCAL_OPR</Setting>
    <Setting Target="Host" Name="ApplicationName">MLA</Setting>
  </Item>
  
  Ens_Config.Item
  
  *LoggingTargetHostOPR_LOG_SOCAL_OPR ApplicationNameHostMLA

Production XData block

<Item Name="test" Category="" ClassName="EnsLib.HL7.Operation.HTTPOperation" PoolSize="1" Enabled="false" Foreground="false" Comment="" LogTraceEvents="false" Schedule="">
    <Setting Target="Adapter" Name="HTTPServer">localhost</Setting>
    <Setting Target="Adapter" Name="HTTPPort">30021</Setting>
    <Setting Target="Adapter" Name="Credentials"></Setting>
    <Setting Target="Adapter" Name="URL"></Setting>
    <Setting Target="Host" Name="ArchiveIO">1</Setting>
    <Setting Target="Host" Name="AlertOnError">1</Setting>
    <Setting Target="Host" Name="InactivityTimeout">10</Setting>
    <Setting Target="Host" Name="QueueCountAlert">10</Setting>
    <Setting Target="Host" Name="QueueWaitAlert">10</Setting>
    <Setting Target="Host" Name="AlertRetryGracePeriod">10</Setting>
    <Setting Target="Host" Name="AlertOnErro">0</Setting>
    <Setting Target="Host" Name="PoolSize">1</Setting>
    <Setting Target="Host" Name="PoolSiz">1</Setting>
  </Item>

Ens_Config.Item

"""HTTPServer Adapterlocalhost" HTTPPort Adapter30021 Credentials Adapter URL Adapter ArchiveIOHost1 AlertOnErrorHost0 InactivityTimeoutHost0 QueueCountAlertHost0 QueueWaitAlertHost0 #AlertRetryGracePeriodHost10 AlertOnErroHost0 PoolSizeHost1 PoolSizHost1
Any help is appreciated.

Thanks for the response Kevin. Using this, I have modified my code to disable all the "Alerting" settings ( even though, they might not be present in the Ens_Config.Item table, but present in the Host class settings in mgmt portal(green color))
OID is , OID of the Ens_Config.Item table.
Here is my code.
Let me know, if I have to change anything.
UpdateSetting(Oid) public
{
Set sts = 0
Set tStatus = 0
If ($Get(Oid) '="")
{
Set item=##class(Ens.Config.Item).%OpenId(Oid)If $IsObject(item)
{
Set tSC = item.GetStaticSettings(.pList)
If $$$ISOK(tSC)
{
         Do item.PopulateVirtualSettings()
           Set n0 = $O(pList(""),-1)
           Set n = item.VirtualSettings.Count()
           For i = 1:1:n 
           {
            Set pList(n0+i) = item.VirtualSettings.GetAt(i)             //Check the group of this setting and we need only the Alerting group settings
            If ($LIST(pList(n0+i),16)="Alerting")
            {
             Set SettingName = $LIST(pList(n0+i),2)
             Set SettingType = $LIST(pList(n0+i),1)
             Set SettingDataType = $LIST(pList(n0+i),8)
            Set tSetting = item.FindSettingByName(SettingName, SettingType)
            //Write SettingName,!
            //ZW pList(n0+i)
            
            //If the Setting DataType is String set as empty, otherwise zero
            Set SettingValue = $Select(SettingDataType="%Library.String":"",1:0)
            
            //If the setting is present in Ens_Config.Item table/Production Host class, set the value alone, otherwise Populate the setting into it.
            If '$IsObject(tSetting) {
Set tSetting = ##class(Ens.Config.Setting).%New()
Set tSetting.Name = SettingName
Set tSetting.Target = SettingType
Set tStatus = tSetting.ValueSet(SettingValue)
If $$$ISERR(tStatus) Quit
Set tStatus = item.Settings.Insert(tSetting)
}
Else {
Set tStatus = tSetting.ValueSet(SettingValue)
}
Set sts = item.%Save()
            
       }        
           }     
     }
}
}
Quit (sts&&tStatus)
}

Hi Kevin,
I tried the same steps, but not working, same issue as before . 
My version : Ensemble 2017.1
$ZV : Cache for UNIX (Red Hat Enterprise Linux for x86-64) 2017.1.3 (Build 317_0_18252U) .