Rollup Query Help

I found this great rollup query example that uses grouping and sub
totals. Would it be possible to expand on this and include a group
within a group and subtotal each group? For example, parent product then
child product? Help appreciated. Thanks.
Frank

SQL:
SELECT
CASE
WHEN (Grouping(CategoryName)=1) THEN 'MainTotal'
ELSE CategoryName
END AS CategoryName,

CASE
WHEN (Grouping(ProductName)=1) THEN 'SubTotal'
ELSE Productname
END AS ProductName,

Sum(UnitPrice) as UnitPrice,
Sum(UnitsinStock) as UnitsInStock

FROM Products
INNER JOIN Categories On
Products.CategoryID = Categories.CategoryID
GROUP BY CategoryName, ProductName WITH ROLLUP




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