How To Create Parent Child drop down list from custom table

  • I am writing a plugin and I want Create Parent Child drop down list from custom table with Ajax, I can do this with PHP but I think in WordPress it’s different.
    My problem is how can I send id from parent dropdown to child dropdown and load <option> on it ?

    I want when I select Project from Parent Dropdown, in the child Dropdown load Tasks related to selected Project.

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