I have these two bookmarked, see if it helps:
Sum lead scores in Detail view
community.suitecrm.com/t/calculate-and-display-total-lead-scores/55634
Show total of values in Opportunity List view
community.suitecrm.com/t/displaying-a-total-at-bottom-of-opportunities-listview-in-7-10-5/59613#68373
These are code solutions, though… a Workflow can’t have a direct impact on UI (it runs in the backend), although you could eventually figure out a way to add everything and put it into a field, so it could reach the user in a view after a refresh. But honestly I don’t think Workflows are the way to go here.