Going to OmniStudio & select DataReptor .
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Select the object and specify the data do you want to use as a filter for this object to filter.
Click on the output tab and map the required data through the respective fields.
Note-While doing Sobject mapping it is necessary to map the required fields.
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Go to preview tab and Execute .
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Salesforce guide == https://www.apexhours.com/query-multiple-objects-with-omnistudio-dataraptors/