feature/composite-variable-determination

[tohuynh]

Pull request recommendations:

• Name your pull request your-development-type/short-description. Ex: feature/read-tiff-files
• Link to any relevant issue in the PR description. Ex: Resolves [feature/add-link-checker #12], adds tiff file format support
• Provide context of changes.
  Improve composite variable determination. No longer relies on hard-coded str values.
  Instead, update the variable's type and hyperlink after the composite variable GoogleSheet has been processed.
• Provide relevant tests for your feature or bug fix.
• Provide or update documentation for any feature added by your pull request.

Thanks for contributing!