How to add new ancillaries ?

[Stuie]

Thanks a lot Stuie, the problem was this stupid semi-colon missing...

EDIT : How can I restrict the acquisition, for example it is possible to restrict an ancillary to a culture or a faction, but if for example I want an ancillary for romans_julii and romans_brutii but not available to romans_scipii, how can I make that ?

Restrict by faction:

          and FactionType romans_brutii

Restrict by culture:

          and CultureType roman

To do the reverse, just add the word "not" after the "and".