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Can I change the fill character for /simulation? Right now it is "_" can I customize?
The underscore character itself can't be changed for the percentage based simulations. Within the user interface you can define various other simulation options including own Prefix and Suffix strings, so that the underscore is not used anymore. These settings can be exported into an options file.
The online help https://docs.sdl.com/785448/420414/sdl-passolo-help/batch-mode-commands has an example on how to call the simulation and loading a specific options file in the /simulate chapter.