Assuming you have one row of data in your query per product, you can put the
matrix in a list which groups on =Ceiling(RowNumber(Nothing)/4) and put
PageBreakAtEnd on either the list's grouping or on the matrix.

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I am using Matrix in my report.

I have One Row Group (ProductID) and 7 Static rows.
Expression for my ProductID Group is =Fields!ProductID.Value

How can I set the Page break so I can accomodate 4 Row Groups (i.e) 28 lines
on one page and then goto next page.

Any Suggestions.