On user object (null driver) or in schema (probably LDIF)?

In schema,

can you provide some sample and how to perform ?

Search anywhere for LDIF import. 

If you can offer more information or specific use case, we can offer other ideas with more info.  But there is very little to go on here.

But a short version - go find an LDAP Browser (Apache Directory Studio, Softerra LDAP Browser, anything, and export an object.

That will show you the initial LDIF format. I think Apache DS will output to CSV as well and maybe input from CSV. 

It is not for user objects. 
It is for schema. I have 120+ brand new custom attributes to be created. can you help here please ?

Have tried the documentation yet?

Using LDIF to Extend the Schema#

www.netiq.com/.../b1j6ajkf.html

Personally, I kind of like .sch format.  :)  I like the ability to 'add' an attribute to a class, whereas in LDIF you have to rewrite the entirety of the attributes to the class.  And if someone has added other attributes than you were expecting, and you re-write it with your list, you may lose them.

Use Designer, export an example in SCH or LDIF format and work from there.

Designer - Identity Vault icon, right click and Manage eDirectory Schema.  Then you can select a class or attribute to export in either format.

You can then import them back in and push the changes to eDir. 

This has the extra benefit of mistakes break (at worse) the Designer model, and not eDirectory.