Hi Rubem,
When you say you need to extract some "cmdb registers" - what does that mean specifically? Are you looking to extract CI's from one system and load them into another system?
From a support standpoint we dont support that just for the sole reason that there are multiple tables involved as well as each of those tables having columns with relationships to columns in other tables etc. It can get ugly very quickly if its not done right, thus its something that we dont document.
Now thats not to say it cant be done because there are plenty of folks out here who have gotten it to work successfully without any problems.
The main table that CIs are held in on CMDB would be ca_owned_resource. Those records may also have corresponding records in the usp_owned_resource as well.
If you have an attribute on those CIs that is the same across all of them, you could in theory do a a pdm_extract with a where clause against the "nr" object to pull the ones you want and load them into the other system. As long as any data refereneced by those CIs such as contacts, locations, organizations, etc. are aready existing in the target system and have the same Identifiers, then you should be OK.
Hope this helps a bit.
Thanks,
Jon I.