"make distribution," but more than one filesystem at destination?

[Jeffrey Bouquet]

UPDATING from what I have read does not go into detail in the case that the destination has separate /var
etc partitions.  A variable to set, or procedure, or one should rsync the contents onto the filesystems after install?

Experiences welcomed.  Also maybe into the UPDATING file(s) [ usual one; v11 one...]  ... unless it is not
recommended.