Hi,
in extend to Jon answer my first question is to where did you created those custom attributes?
on the nr object or in the extended table?
if directly on the nr you can quickly create a new tab like any others and reference your attributes there.
just create your htmpl form with factory to be nr using a tab template in wsp and refer to it using the pdm_tag in the cmdbNotebook.htmpl file
something like: <PDM_MACRO NAME=TAB TITLE="Additional attibutes" FILE="nr_mytab.htmpl">
if done on the extended table you can just display those attributes by adding them into the corresponding htmpl (nr_cmdb_<extension>_tab.htmpl) that correspond to this family but depending on the family this list can already be long.
Then it come a little more tricky as mentioned by Jon but can also be done with some extra may you want to separate those.
my 2 cents
/J