first
1)how we will configure Cascading Dropdowns using rule inputs ?
next
2)after configuration how we will do in process model level by using smart services in PM?
please suggest?
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Is this about this UI pattern: https://docs.appian.com/suite/help/22.2/recipe-configure-cascading-dropdowns.html
If yes, this should get you started: https://docs.appian.com/suite/help/22.2/Adapt_a_SAIL_Recipe_to_Work_with_My_Applications.html
What do you mean with "how we will do in process model level by using smart services in PM"?
We do not know what you want to achieve. The lack of details makes supporting unnecessarily difficult.