PI blocks & AS numbers

x-ncc-regid: ru.combellga Good day, colleagues! My name is Dmitry (DD4440-RIPE) from OJSC COMBELLGA, ISP , Russia. It's for the first time to registrate PI block for our customer. And we need some assistance. As we know we have to registrate sepatare AS number for a PI block because this block could be have an independed routing rule. Is it right? Can you explain us which steps should we make for succeed the aim. Which RIPE forms cloud be used? Which documantation cloud be read?