i don't know if you can get them into your crosstab but if you create a subreport in that subreport create a shared variable that has the SUM (or Count or whatever) of the field you want assigned to it.
IN your main report create that same shared variable.
You can do a SUM (or count of whatever) of the field you want in the main report.
Create a formula field in the main report that adds variable and summary field.
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