Installing Multi-Site on Multi-Network sites.

Hi.
I have the WP 'Multi-Network' plugin installed, and have been able to create a number of new networks using the 'Primary Domain' name of the initial Multi-Site install!!

My question please is, can I install 'Multi-site' on each of these 'Multi-Network' sites?

If yes, how; please?

Thanking you in Advance.

Regards

Johnv