Constants as input variables in process

Good morning everyone. I am building a process that builds an ID.

The ID is built in the following way:
1)Alias: Label of the selection of a dropDownList in a Form, stored in a constant. I need to have this as a parameter in my process

2)ID: Value of the selection of a dropDownList in a Form, stored in a constant. I need to have this as a parameter in my process

3)CurrentDate: gathered with the following expression: datetext(now(), "yyyyMMdd"), inserted in a Script Task 

Can someone help me with the first two points? I am running version 16.3 of Appian

Thank you all and have a nice day, Luca.

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