Yes, Cflow provides a cool way to fill your main form field value from the table total with the help of Footers. This is applicable for Integer and decimal type table fields only. Select the control center under Admin in the left menu and select your workflow. You can see the Table Footer icon as shown below.
Now select your table name from the list. The Integer and decimal fields will be listed. You can turn on or off the footer control. Then select the main form field from the right side drop down list where you would like the Footer value to be populated. Finally hit the Save button.
You no longer need to do the math manually and can avoid the costly mistakes and typos. Try it right away.