Hello @SteveF1258, your thread landed in the “Using Freshservice” area, but I see you tagged it “Freshdesk”, so I am not sure what product you are using. For the freshservice Service Catalog you cannot have a “Data Sourced” dropdown field type and then use dynamic fields. To use dynamic fields you have to manually provide the choices of your dropdown.
However you can create multiple “Multi-select” drop down fields and choose a data source for those fields. They just will be independent of one another. For data that is not native to freshservice (ex. users, locations, assets) you can create a custom object for that data and then access that custom object in a Multi-select data sourced drop down field.
Hope that helps!
@zachary.king Thank you for the advice. I will have a go at creating that.