Sum the children, derived column

I have a hierarchical grid and need to add a new column for the parent that's value is the sum of the values of a particular column from the children.

Any help much appreciated!

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Finally got there, thank you.

I had to populate the children I wanted to sum their data OnInitializedAsync which makes sense (added to the Expand list, makes sense the children weren't there because normally it doesn't get them until you drill down, anyway, thank you.)