How we call interface in another interface
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Like any other expression rule.
https://docs.appian.com/suite/help/21.4/Expression_Rules.html#call-an-expression-rule-from-another-expression
docs.appian.com/.../using_interfaces_in_appian.html
hi, To call any child interface into a parent interface you can use prefix "rule!" and then interface name. For more details you can go through the link which Stefan Helzle provided.