Monsters as Player Characters

[Ughbash]

In Bestiary they had a section on playing a monster as a Player character.

Basically if you were playing a campaign starting at level 3 you could play a CR2 monster and add 1 character leve to it. Then when you had gotten 3 class levels you got an effective class level as they lowered the CR by 1 (down to a minimum of 1/2 orginal level).

So a Lyrakien (Cr2) Druid 1 should be a third level character and a Lyrakien druid 6 should be a 7th level character.

When I try to creat a Lyrakien Druid in Hero Lab it treats the first 3 levels as Lyrakien sicne it has 3 hd....

Is there a setting to use "Monsters as Player Characters"?