By default, Soulver displays a total of all your lines in the bottom right hand corner.
Quick totals appear in the bottom right
You can also show the average of your lines by right-clicking on the total and choosing Switch to Average
If the total is not helpful in your particular workflow, you can hide it by hovering over it and clicking Hide. To show the total again, go to the View menu and choose Show Total.
Subtotals
Press ⌘T or hover over an answer and click the make subtotal button (the middle button) to make a line a subtotal. A subtotal line will add up all lines above, up to the next subtotal or heading (#).