A suggestion is to have another section called Case File under Process Data / Process Variables.

Case File section would show up only when the process is adhoc ( Case Definition ).

Acceptance criteria:

Tested browsers:

• Chrome (linux)
• Firefox (linux)
• IE (Windows)
• Edge (Windows)

Test Cases:

• It is possible to set Case File Variable
• Case File variable is persistent (preserve value between process reopen)
• Case File variables can be selected as Tasks/Events Source/Target
• Completion Conditions in Ad-hoc sub-process can be set to Case File variable. (It is possible because you can set any text value there.)
• Case File variable can be set only for entire diagram, not for specific sub-process
• Runtime (runtime is not supported so far for Case Definitions created by new Designer)
• Test coverage of new code
• New code review