Current scope and priority is to:
a) Stabilize and
b) Enable a distributed monitoring strategy in place.

We would like to know if Zabbix 3.2 still supports the Hierarchical setup Nodes - Parent-Child. If yes, do you've documentation link to sample reference Architectures and what is supported, steps to enable etc. ?

Zabbix 2.0 talks about the Hierarchical setup of Monitoring via Zabbix Nodes - Parent-Child.