Proxy user with Multiple Domains for LDAP-UX

[Keynes Lee]

I have 2 domains. 1 LDAP-UX client
Root domain : test.com
Sub domain : a.test.com
LDAP-UX Client : hpux1

I create a proxy user "proxyusr"
And another account "hpux1" for host in domain "test.com"
Also, I created a keytab file by using command "ktpass". Now the users in test.com can login hpux1 normally.

But I really have no idea about how to make the users in "a.test.com" to login hpux1.

please help me to configure it.
And please don't just give me the HP manual. as I had read it hundreds times. It's a REALLY confused document.