https://community.appian.com/discussions/f/new-to-appian/23871/calling-an-interfaceHow we call interface in another interfaceen-USTelligent Community 12https://community.appian.com/thread/91835?ContentTypeID=1Thu, 03 Mar 2022 13:53:34 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:a31a28dd-d393-4160-9864-cb050ab4aefdGopalK<p>hi, To call any child interface into a parent interface you can use prefix &quot;rule!&quot; and then interface name. For more details you can go through the link which&nbsp;<a class="internal-link view-user-profile" href="/members/stefanh0002">Stefan Helzle</a>&nbsp;provided.</p><div style="clear:both;"></div>https://community.appian.com/thread/91827?ContentTypeID=1Thu, 03 Mar 2022 11:10:25 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:ad08628b-5370-4511-b7e2-703e07328e1cStefan Helzle<p>Like any other expression rule.</p> <p><a href="https://docs.appian.com/suite/help/21.4/Expression_Rules.html#call-an-expression-rule-from-another-expression">https://docs.appian.com/suite/help/21.4/Expression_Rules.html#call-an-expression-rule-from-another-expression</a></p> <p><a href="https://docs.appian.com/suite/help/21.4/using_interfaces_in_appian.html#">docs.appian.com/.../using_interfaces_in_appian.html</a></p><div style="clear:both;"></div>