Hi bu,
I don't know about the dxmanager gui but if you fancy command you could use something something like this:
(assuming you are in the DXHOME bin directory)
- dxnewdsa cropusers 389 "o=someorganisation" <-- this last one is an example prefix
- dxserver stop cropusers
- dxloaddb cropusers D:\mydir\someorganisation.ldif
- dxserver start cropusers
Now you should be able to connect to your directory using jxplorer or anything you like
this is what you can use on Windows to create a CA Directory
i assume there are simulair commands availble for linux, but i can't verify this for you at the moment.