So see the create a monsters up there? one is wearing a draculaura leg and another has lagoona arms (and bits from a clone spider body)
You’ll want a hacksaw or dremel with saw bit (wear protection glasses!!!), a grinder or a wire cutter + craft knife for cutting down plastic and a pair of pliers to crack bits open. Use a towel or gloves as cut plastic can be sharp.
Cut the legs about 1cm above the knee joint, a line across the upper torso from shoulder to shoulder and one about 8mm down the neck to keep the neck joint.
Put your pliers across the neck and knees to snap them off + three extra slices down each knee and across the neck to get your neck peg and legs free.
Dig your pliers into the upper torso and pull back while pulling down on the torso with your other hand: you want to crack open the torso by bending the plastic as trying to dremel your way to the shoulder bits will take ages.
You then file/grind/slice down the legs and shoulder pegs to match your create a monster bits. I tend to make them square shaped by doing 4 sides, it gives them a little bit more grip.
It’s not pretty but it works!
If possible I like to keep bodies and give them clone spider arms ($3 for 3 pairs of black arms!) but these were floppy, yellowed and had already been experimented on.