You open initialization block B, and then specify that block A will execute before block B. Data Science Mathematics In RPD, I created a new init block with session variable PRODUCT and row wise initialization is set. If Prime Time were one of those segments and corresponded to the hours between 5:00 PM and 10:00 PM, you could create a CASE statement like the following: where Hour is a logical column, perhaps mapped to a timestamp physical column using the date-and-time Hour(<