Firstly, you need to create two Details Sections in your report, to do this go to Report menu, and then Section Expert.
From here, click on "Details" on the left, and then click [Insert].
You should see Details A and Details B. Click [OK] and go back and make sure your report is showing all details in Details A, with Details B empty.
Go back to Section Export, and tick the "Suppress No Drill Down" then click on the formula editor to the right of this and copy and paste this formula:
Remainder (RecordNumber,5) <> 0
This should, all working well, insert a blank line for every 5 records you have in the report.
I have used this on Crystal XI numerous times, not tried on previous versions, assume its the same.
UrbanHim
Crystal XI Report Writer
London