Aggregate Model / Table Sum

I am looking at how to build an aggregate model for a table to display a simple sum across the objects in the model. I have followed Page Not Found — Skuid v15.1.6 Documentation but don’t need the filters involved. The screenshot underneath the heading “…and by Industry!” highlights the sum I would like to create. I have an aggregate model, have made groupings etc. But I cannot get a sum of the values in one column. Jacob