Ayesha,

If have simple logic for what items should be displayed for the dependent picklist, you could try adding some UI Only fields with the same label and show/hide (conditionally render) the one you want for a given value selected on the field that drives the dependent picklist.  You’ll need to change your Save button to call multiple actions and add an Update action from the UI field to your ‘real’ field in Salesforce.  Follow this action with a Save of your model.

If not, your best option is to use a snippet to drive what values show on the field.  Here is a community posting that shows how to do this:
https://community.skuid.com/t/how-do-i-render-custom-picklist-values

Thanks,

Bill