Problem with leveling monsters

[Druthlen]

Hello, I am having a problem adding HD or Develeing a Monster so that I can use it as a younger version or a beefer version. Is there a program that anyone has developed that is useful for this purpose and is specificaly designed for Pathfinder. I am willing to pay if it is good. I looked at RPGXplorer and it seems development on it has ceased and it isnt pathfinder friendly yet. Anything else out there?

[udalrich]

There are Young and Advanced templates in the Bestiary or at the PRD

They have quick rules for doing it on the fly (e.g., add +2 to X and Y rolls) and rebuild rules that add more detail if you're doing it in advance and care about details.

There's also a Giant template which may be useful for making a beefier version. All those templates are +/- 1 CR and fairly straightforward to use. If you want more of a change, you could apply Advanced and Giant, or possibly Young twice. In that case, you'd also want to look at the final result and make sure the CR is still reasonable.