Assigning pre-fixed IDs to submissions on server-side

Hi,

My field staff is collecting data from the field. Assuming they are online, when the submission comes to the server, I need to assign them an ID from a pre-fixed IDs list, and approve their form. So when they get the data back on their phones, they could tell the assigned ID to the visitor, right there in the field.

Any way to manage this via Entities?

Thanks