You can use "Copy a parsed text to a field" post-function (provided by JIRA Workflow Toolbox) to copy the value of Cascading Select custom field from parent issue into child issue. This post-function should be used in the workflow of child issue.
Example: Let's suppose we have a Cascading Select field called "Country and City" with field code %{50901} (this code depends on each particular JIRA instance), the you should use the following configuration:
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Explanation: We are composing a text with parent and child values of cascading select field in parent issue, separating both values with a comma character. Writing this text into cascading select field of current issue (child issue) will update its value.
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