Add SUM to 'Budget' column

Can you add SUM to the budget column in the new table please. For those of us that want to use it can select this option to provide a budget sum of all sub-projects in the parent row. There used to be an option of sorts in the old table, some manual intervention was still required, but in the new table there is no such option/functionality. We have a number of sub-projects to deliver different products within a single 'master' project plan and this would help across the many many projects we run.