Add an OfferID to an existing partition

[TommyTek]

Hello,
  I've created a product partition with 2 offers this way (it works):

// create subdivision    
    $operations = [];
    $root = ProductPartitions::createSubdivision();
    $criterion = 
ProductPartitions::asBiddableAdGroupCriterion($adGroup->getId(), $root);
    $operation = ProductPartitions::createAddOperation($criterion);
    $operations[] = $operation;
    
    $ean = new ProductOfferId();
    $ean->setValue('0000000001');
    $eanUnit = ProductPartitions::createUnit($root, $ean);
    $criterion = ProductPartitions::asBiddableAdGroupCriterion(
        $adGroup->getId(),
        $eanUnit,
        10*10000
    );
    $operation = ProductPartitions::createAddOperation($criterion);
    $operations[] = $operation;
   
    $ean = new ProductOfferId();
    $ean->setValue('0000000002');
    $eanUnit = ProductPartitions::createUnit($root, $ean);
    $criterion = ProductPartitions::asBiddableAdGroupCriterion(
        $adGroup->getId(),
        $eanUnit,
        11*10000
    );
    $operation = ProductPartitions::createAddOperation($criterion);
    $operations[] = $operation;

    
    // Other
    $ean = new ProductOfferId();
    $eanUnit = ProductPartitions::createUnit($root, $ean);
    $criterion = ProductPartitions::asNegativeAdGroupCriterion(
        $adGroup->getId(),
        $eanUnit
    );
    $operation = ProductPartitions::createAddOperation($criterion);
    $operations[] = $operation;
   
    
    $adGroupCriterionService->mutate($operations);  



Now I want to create a function that adds new  ProductOfferId to current 
partition, but I don't know how to retrieve the $root element without 
creating it again (and without doing a query to read the whole partition). 
What is the easiest way to get the root element of a product partition?

Thank you

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