Hi @ramesh_r ,
The core logic is contained within a script include (e.g., ChangeUtilsSNC) that is executed by a business rule/UI Action named "Refresh Impacted Services"
The process begins with the CIs that have been added to the Affected CIs related list on the record (e.g., a change request).
It then searches the Service Configuration Item Association [svc_ci_assoc] table for any services that are associated with those affected CIs. This table is populated by Service Mapping, which discovers and maps the connections between different CIs.
For other types of CIs, the system traverses the relationships defined in the CI Relationship [cmdb_rel_ci] table. This identifies other CIs that are dependent on, or used by, the affected CIs.
Please refer KB: https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0955325#:~:text=4854%20Views,...
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Thanks, GP
