How to create "dynamic group" in ldap?

I want to create dynamic group in openldap with Apache Directory Studio but groupOfURLs object class not available.

The dynamic group feature is not present by default (that's why you can't find the groupOfURLs object class). You need to define and add the dyngroup.schema to cn=config.

The dyngroup definition can be found here : dyngroup.ldif

Then, for the dynamic group feature to work, you need to enable the dynlist overlay, which also need to be defined, see slapo-dynlist.

You can refer to this issue as a kind of walk through.