This is the documentation for ConfiForms Server/Data Center app
However, this might also work for ConfiForms cloud and in most cases it does. But please see this page to understand the differences between server and cloud versions of the ConfiForms app.
This is answer to a question asked in Atlassian Community - https://community.atlassian.com/t5/Confluence-questions/Using-a-field-in-form-A-to-filter-a-table-with-data-from-form-B/qaq-p/2149550
Shows details of a record (other fields) selected via smart dropdown as a table inside the form view