Permissions to nested groups in Zabbix 3.2.1

[SzymonM]

How do I configure permissions with asterisk in Zabbix?
I have two hostgroups:
my_app/datacenter1
my_app/datacenter2

I would like to grant some usergroup permissions to
my_app/*
so that when I have new datacenter, users will be granted permissions automatically.

I'm unable to enter my_app/* as hostgroup though, I can only pick the specific hostgroups (full name, no asterisks). That would force me to update permissions each time I add datacenter.

[SzymonM]

I think I got it.
I need to create parent hostgroups first.
Then, when choosing permissions, I choose parent group and asterisk sometimes happen.

So, the group structure should be
my_app
my_app/datacenter1
my_app/datacenter2