You can create a relationship between Equipment assets and Services on the Related Asset line item object when a service asset is created. You can configure and sell services for one or multiple products simultaneously, supporting standalone and bundle scenarios. This is supported using the following APIs:

For associating Service to Equipment: POST {{baseUrl/api/cart/v1/carts/cartId/items}}

For Query Related Asset Line Item: POST {{baseUrl/api/data/v1/query/RelatedAssetLineItem}}

"FromLineItem": {
                "Id": "5605ac00-d87c-4c89-bc32-5daaa47cc6d7",
                "Name": "DP_ABO Service Standalone-02"
            },
            "RelationTypeFrom": "Is Serviced By",
            "RelationTypeTo": "Is Service For",
            "ToLineItem": {
                "Id": "2bc98a6f-c16b-4c88-888d-6d16a9ed31a6",
                "Name": "DP_ABO  Equipment Standalone-02"
            },