How to retrieve data in the entity list from the Dropdown in the Portal?
Could you please share more about your needs?
If you want to convert a LookUp field to Dropdown field on an Entity form, you have to create an Entity form metadata to modify the control style to 'Render LookUp as DropDown'.
More details please refer to this blog:https://www.cloudfronts.com/customizations-crm-portal-entity-forms-using-entity-form-metadata/ .
Beyond that, you can have html webresource on the entity form and it should render to portal web page, apart from that you can use webtemplate and there you can have your javascript to create html drop down. You can use custom javascript section on the webpage/portal entity forms for the same.
In addtion,maybe this link will help you a lot:
Show Data in Filter Dropdown - Entity Forms - PowerApps Portals
Best Regards,
Bof
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