For more information on sub-configurations and configuration families in BLIS, please read the Configuration Guide, which can be viewed in markdown-rendered form from the BLIS wiki page.

If you don't have time, or are impatient, take a look at the config_registry file in the top-level directory of the BLIS distribution. It contains a grammar-like mapping of configuration names, or families, to sub-configurations, which may be other families. Keep in mind that the / notation:

<config>: <config>/<name>

means that the kernel set associated with <name> should be made available to the configuration <config> if <config> is targeted at configure-time. (Some configurations borrow kernels from other configurations, and this is how we specify that requirement.)