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You'll need to think of a different approach. As you've discovered, Summary and GetSummary cannot be used to produce subtotals on different rows of a portal.
If you were to use this type of data model:
With one record in Stocks for each stock that you are tracking...
Then aggregate functions such as Sum() and Count() can be defined in Stocks to get totals for just the individual records in Stock Cycles for a given record in Stocks.
There may be some ideas here. This should bring you to a found set of several articles about portals and summary fields:
Perhaps the second one in the list, specifically: