How to include custom data as part of form submission?

Hello everyone, I am trying to build a device count calculator that we send out to clients to help them figure out how much coverage their network needs. Functionality is pretty simple - slide for each section and everything gets added up at the bottom.

Where I am having trouble is including the total devices as part of the form submission. Is there a way I can include the “Total Devices” along with name & email when submit is pressed? Brand new to webflow so sorry if this is a dumb question!

Here is my site Read-Only:

Published Version