Extend Monitoring Templates in child device classes

Hi Team,

We have requirement, that we have device classes as below:
/Server/SSH/Linux/Category-A
/Server/SSH/Linux/Categpry-B

We have a monitoring template, SampleMonitoringTemplate which bound to device class /Server/SSH/Linux. So the same monitoring template applies to /Server/SSH/Linux/Category-A and /Server/SSH/Linux/Category-B.

But here, I want to add specific datasources, graphs, and thresholds to Category-A and Category-B devices seperately. Like:
For Category-A devices:

    SampleMonitoringTemplate + New DataSource (NDS1) + New Threshold (NT1) + New Graph (NG1)

For Category-B devices:
    SampleMonitoringTemplate + New DataSource (NDS2) + New Threshold (NT2) + New Graph (NG2)

Currently, we are achieving this by replicating SampleMonitoringTempalte as below:

/Server/SSH/Linux:
    templates:
        SampleMonitoringTemplate:
            datasources:
                <some base data sources>
           thresholds:
                <some base thresholds>
           graphs:
                <some base graphs>

/Server/SSH/Linux/CategoryA:
    templates:
        SampleMonitoringTemplate:
            datasources:
                <some base data sources>
                New Data Source (NDS1)
           thresholds:
                <some base thresholds>
                New Threshold (NT1)
           graphs:
                <some base graphs>
                New Graph (NG1)


/Server/SSH/Linux/CategoryB:
    templates:
        SampleMonitoringTemplate:
            datasources:
                <some base data sources>
                New Data Source (NDS2)
           thresholds:
                <some base thresholds>
                New Threshold (NT2)
           graphs:
                <some base graphs>
                New Graph (NG2)

Please suggest the way to optimize the above code.