Creating different creature blueprints

[Legacy_Grani]

                Hello!
I wanted to make difficulty scaling in my module by using encounters with different versions of the same creature, eg. Skeleton Warrior w challenge rating 1/2, Skeleton Warrior with CR 3 and so on. 
How can I create such varying blueprints fast and so that the difficulty would match the CR (e.g. I cannot simply increase levels, because even though challenge rating will increase, the creature will still be very weak)?
Thanks for help. '>
               
               

               
            

[Legacy_WhiZard]

               Create a level-up package.  Add lines to packages.2da and then create 2das for the skills, feats, and equipment on level-up.  Though this would not add special abilities with levels, you could use UMD and a progression of spell scrolls to emulate this.
               
               

               
            

[Legacy_Grani]

               If there's no faster option, I think I will go with this. Thanks. '>