Hi Marilou,
There is nothing out of the box that will handle this, but I can think of a few different configurations that might get you close.
Firstly - What are your reasons for wanting to do this? This will help us understand your needs and will drive the configuration required.
If you're just wanting to stage distribution you could create 5 Software Update Policies each with 100 machines in them and configure them to deliver patches on different days of the week. You would need to create filters that matched this configuration, but it'd be straight forward to do so in SQL - first 100 records in one filter, records 101-200 in the second filter.
For example:
Software Update Policy 1 - Filter 1 (0-100) - Monday
Software Update Policy 2 - Filter 2 (101-200) - Tuesday
etc.
Thanks