Prestige class BAB

[PosterX]

I noticed prestige classes have only one column for BAB even when it goes up to +10. Does it mean that the BAB only adds to the first attack?

ex Ftr10/Dwarven Defender 10

ftr BAB = +10/+5
dd BAB = +10

so together +20/+5? Or am I totally misunderstanding the whole thing?

[Xyx]

Number of attacks is directly related to your Base Attack Bonus, not to when your classes list the extra attacks. If you gain three levels Fighter and another three Barbarian, you'd have +7/+2 attacks.

At least... that's how PnP works.