No more than n detail per report page

If the table / cursor isn't indexed, add a group with the expression 

FLOOR((RECNO()-1)/n)

and check group starts on new page

If the table / cursor is indexed, first add a report variable variablename with

Reset value based on: = Report

and

Calculation type: = Count

Then add a group with the expression

FLOOR(variablename/n)

and check group starts on new page

See http://www.tek-tips.com/faqs.cfm?fid=7718