Update add somme function and GUI tools

[JM2K69]

Requirements

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• Have you (put an X between the brackets on each line to confirm):
  • [ ] Written new test cases to ensure no regression bugs occur?
  • [ ] Ensured all test cases are now passing?
  • [ ] Ensured that PowerShell Script Analyser issues and warnings are completely resolved?
  • [ ] Updated any help or documentation that may be impacted by your changes?

Description of the Change

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Testing

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Associated/Resolved Issues

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