How to make leg sleeves or hexpads longer in global?

I hope someone could teach me some steps on how to make the leg sleeves or hexpads longer...
I had some info that it could be done thru hex editing but I dont know where to find the values and what are these values that must be edited...
What tools should I use?

Thank you in advance for the any reply or answer to my inquiry...

You can make it longer by editing the body files in the global.

You can make it longer by editing the body files in the global.

What particular body file sir?

How do I edit those? what tools should I use?

Thanks...