If WS-BPEL is old functionality that has not been used for a while due to lack of general interest circa 2022. Even more so from .NET what then is the alternative for WS-BPEL?
Describing your Actions and their Workflows using terms from an Ontology (a Data Dictionary that describes Entity and Entity Relationship Types in machine-computable form).
WS-BPEL isn’t the way to address Actions and Workflows circa 2022.
For instance, are you trying to import and export data from you system to something like Biztalk, for instance?
I encourage you to describe what you are trying to achieve conceptually first