Managing Summary Columns
When two tables are related, you can create summary columns. Summary columns are columns in a master table used to represent calculation of specific data from a detail table. For example, the Invoices table displays the total amount for all invoice items stored in the Items table.
As a result, the Total summary column calculating total items amount will be added to the Invoices table:
To add a summary column to the related table:
Click the Setup link in the top right corner of the window
Select a table you need.
From the setup menu select Tables > Manage relations.
In the Relations form click the Add Summary button next to a necessary relation.
The Summary column form will be displayed:
