Add a Custom Field to a Report

Create a Report and access the Advanced Report Builder. Select appropriate fields on the left menu bar report data. 

Enter the name of the Custom Field you wish to add to the Report. Available fields automatically populate. Click the desired Custom Field name from the menu to add it to the report. 

Example: Salesforce ID Custom Field

You can also filter by a Custom Field within a Report. Click the filter funnel icon for the desired field and enter the data in the filters section at the top of the report window.