Hi
I want to create an interface in which a user can click on a button which will open the editable child interface and the edited values can later will be saved into the parent interface.
how can i achieve this.
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You can achieve this by related action.
That really depends on the context.
Related actions are meant to allow interaction on records.
If this is just a UI, I wrote a blog post about pop-up windows in Appian: appian.rocks/.../
This is pretty easy to just do inherently on a single form, just the child wouldn't really look like a pop-up (as there's no direct way to do that). Standard methods are to simply show the alternative interface instead of the parent interface, and/or to show it in a section below the original parent.