First I had to look up the word partitura, did not know it.

My results.

Now the good part.
First there is the Notation icon down about 3 inches top left the Note.
There are 3 basic options with lots of technicalities there.

Second 2 icons over from Notation icon is the Piano Roll.
This is tool/s to create/edit MIDI.

Within both of these options are specific track select/modify abilities.

The style part modification within these two+ tools is beyond me.

My direction would be to select a style, listen to its demo, then
decide if you want to use that style.

Start over, NEW the screen, then with only the style selected.
You can now edit notes/and/or Piano roll for any track within BIAB.

Hope this opens some doors needed.

FrankB

Down The Street vs2015 12-03-2014
Win7, AMD QuadA8-5500,16GB,2TeraHD, Komplete 10
PG Ultra Plus 2016,Alesis 12USB, Sonar Platinum