If a multi attack says something like 2 claws (1d6), 4 legs (2d8)
does this mean that the multi attack actually contains 2 claw attacks and 4 leg attacks with the following rolls?
Multi-attack in starfinder means that the creature can make a special full attack action that makes every single attack on the multi attack line. So for a young blue dragon:
Multiattack bite +18 (4d6+19 P), 2 claws +18 (2d8+19 S), tail slap +18 (2d6+19 B)
That's four attacks, each with a +18 on the attack roll, dealing the listed damage on a hit.
Perfect thank you!