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Hello
Please refer to Idea 470896 Mirror in Sheetmetal should update mirror flange/flat reliefs as well.
https://community.ptc.com/t5/Creo-Parametric-Ideas/Mirror-in-Sheetmetal-should-update-mirror-flange-flat-reliefs-as/idi-p/470896
If you need more information, you can request for a case to be opened.
Best regards
Jean Claude
Mirror feature option Fully dependent with options to vary would be needed which is not available in Sheetmeltal: https://www.ptc.com/en/support/article/CS166281