Define list report page breaks by part name
I have a list report which is made up of several parts. They are custom sorted by a list I've made so as to get them appearing in the right order for the task. Let's say we have simply Part1, Part2, Part3, Part4, Part5, Part6.
What I'd like to do is always page break so that:
Page 1 - Part1 and Part2
Page 2 - Part3
Page 3 - Part4 and Part5
Unless I have exceptional circumstances, this will cover all eventualities and ensure that only three pages are printed uniformly per print.
How can I tell FM to do this please as it doesn't look entirely entuitive in the part set up dialog?