Hi,
I hope you have created Dynamic Cascading Parameters,
Try this Create a Group on Invoice Number field this will group all the Invoice Numbers and corresponding values together
then in Group Footer right Click Select Section Expert
Then in Common Tab of Section Expert against New Page After Click the X+2 button and enter the code below
Not OnLastRecord
this is to avoid page breaks on last page.
New Page After will start new page for each Invoice Number so this was you will have separrate pages for the Invoice Numbers and values you have selected.
Then Simply print the report to get separate pages for each invoice value
Cheers
Rahul