Grid axes in levels jobs work exactly the same as grid axes in ordinary jobs. To create a table at one level and update its cells at a lower level, define the table creation level with anlev= on both the tab and l statement. Define the update level with uplev= on the l statement. For example:

This table is created at person level and updated at shop level. It tells you how many people bought each flavor of yogurt in each shop.

You can create the same table using anlev= and celllev= on the tab statement and anlev= by itself on the l statement:

This table is created at shop level, but its cells are updated once per person after all data for that person has been read.