You can define subroutines in "Global Settings", "Global definitions", tab "Form. routines".
You can use theses subroutines and subroutines of other program in smartform like in any other abap program. There is no special syntax or way to pass parameter like in Sapscript.
When you create a "program line" node, you define the global data to be sent/receive in tab "General Attributes" Input and Output parameter windows, then you write your code like in any abap program.
Regards
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