Maybe one of these will help: https://www.jqueryscript.net/tags.php?/Cascading%20Dropdown/ https://github.com/scubism/sqlabs/blob/master/modules/plugin_lazy_options_widget.py http://www.web2pyslices.com/slice/show/1724/cascading-dropdowns-simplified http://www.web2pyslices.com/slice/show/1503/vvmselectwidget-dropdown-chain-cascade-widget https://stackoverflow.com/questions/8146260/best-practice-for-populating-dropdown-based-on-other-dropdown-selection-in-web2p/8152910#8152910
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