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Define the summary field in your related table, not the form view layout's table to get a total based on related records.
There are also aggregate functions such as count, sum, max, min, average that can be defined in the layout's table that compute the same value as a summary field in the related table.
Thanks for your help. It has assisted me somewhat, But of course I would prefer to use the summary field from one table in another's layout. However I think that I have a work around based on some useful info in your other posts.
I don't see the need for a work around here. You just define the field in the correct table and put it on your layout.