"Salesforce" and Informatica are not Business Services. They are Business Applications. Your Production instance of Salesforce is an Application Service that could be called "Salesforce Production", with an Environment of "Production." If Salesforce is externally hosted then the dependencies may end there, but if there are internal infrastructure dependencies, those would be part of your Service Map for Salesforce Production. If you have another non-Production instance of Salesforce then those would be separate Application Services, each with its own infrastructure dependencies, and each relating back up to the Business Application called "Salesforce". A Business Service could be something like "Salesforce Management" or "Sales Forecasting". The Business Service is then broken down into one or more Business Service Offerings. The Offering is the layer where we define the SLA commitments, Availability targets, Operating schedules, RTO/RPO, and relationships to the Service Catalog (i.e. related requestable services e.g. "Remove a Customer Account from Salesforce"). The Offering is also what has that dependency to the Application Service "Salesforce Production". And yes, the Business/Technical Services and Offerings, as well as the Business Applications are typically created manually or possibly imported from other source of record.
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