---
schema_version: "1"
id: 67db9a62ec9f5c9f08f69bf42544244cc2fe5090533463a48f65d1fba1463238
title: Review Objects in the Base Semantic Model (Beta)
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/analytics/264-0-0/rd_analytics_metadata_bridge_extend_review_existing.md
canonical_url: https://help.salesforce.com/s/articleView?id=analytics.rd_analytics_metadata_bridge_extend_review_existing.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 4e2cd03333c54a7f1d6ef1997aa00644cfe37f6ca0f046d617f6922b5e64d2fb
description: During field mapping, the Reports Metadata Bridge shows source objects that are already in the base semantic model so that you focus on the objects that the extend flow adds.
products:
  - Cross Cloud
release: "264"
---
# Review Objects in the Base Semantic Model (Beta)

During field mapping, the Reports Metadata Bridge shows source objects that are already in the base semantic model so that you focus on the objects that the extend flow adds.

![Note](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-analytics-analytics-264-0-0-production-enus/295fead5-b71d-4e1c-9886-4af4d53400b6/images/icon_note.png)

Note This feature is a pilot or beta service that is subject to the Beta Services Terms at [Agreements - Salesforce.com](https://www.salesforce.com/company/legal/) or a written Unified Pilot Agreement if executed by Customer, and applicable terms in the [Product Terms Directory](https://ptd.salesforce.com/). Use of this pilot or beta service is at the Customer’s sole discretion.

When you extend an existing semantic model, the Reports Metadata Bridge doesn't include source objects that are already present in the base semantic model. At each field mapping step, the bridge separates source objects into two groups so that you know what's new and what already exists.

## Field Mapping and Data Lake Object Generation

On the DLO mapping step, the bridge splits source objects across two tabs and a separate section:

![Field mapping and DLO generation for extending a semantic model](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-analytics-analytics-264-0-0-production-enus/295fead5-b71d-4e1c-9886-4af4d53400b6/analytics/images/rd_analytics_metadata_bridge_extend_sdm_field_mapping_dlo.png)

- **Require Action** tab - source objects that need a DLO created before you can continue.
- **Mapped** tab - source objects with a target DLO already mapped for the extended semantic model.
- **Already in the Semantic Layer** section - source objects that the base semantic model already includes. These entries are read-only, and the bridge doesn't create new DLOs for them.

Complete DLO setup for the source objects on the **Require Action** tab, review the entries on the **Mapped** tab, and then continue to DMO mapping. See [Map Fields and Generate Data Lake Objects](https://help.salesforce.com/s/articleView?id=analytics.bi_analytics_metadata_bridge_map_fields_dlo.htm&language=en_US) for the shared steps.

## Field Mapping and Data Model Object Generation

On the DMO mapping step, the bridge uses the same layout.

![Field mapping and DMO generation for extending a semantic model](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-analytics-analytics-264-0-0-production-enus/295fead5-b71d-4e1c-9886-4af4d53400b6/analytics/images/rd_analytics_metadata_bridge_extend_sdm_field_mapping_dmo.png)

- **Require Action** tab - source objects that need a DMO mapping before you can continue.
- **Mapped** tab - source objects with a target DMO already mapped for the extended semantic model.
- **Already in the Semantic Layer** section - source objects mapped to DMOs in the base semantic model. The bridge indicates whether each existing DMO is **Standard** or **Custom**. These entries are read-only.

Complete DMO setup for the source objects on the **Require Action** tab, review the entries on the **Mapped** tab, and then continue to the semantic model generation step. See [Map Fields and Generate Data Model Objects](https://help.salesforce.com/s/articleView?id=analytics.bi_analytics_metadata_bridge_map_fields_dmo.htm&language=en_US) for the shared steps.

Next step in the flow:

- [Generate the Extended Semantic Model (Beta)](https://help.salesforce.com/s/articleView?id=analytics.rd_analytics_metadata_bridge_extend_generate.htm&language=en_US)