i`m trying to make a custom slider but it`s not working properly

My crystal ball's out of order so you'll have to give more information. What kind of slider, what tools are you using, and what's the problem?

bellybutton slider tools: bonedelta , blendunit , simgemoeditor , rslteditor , morphmaker , casparteditor , vpxyeditor , meshhelper , blender 3d and photoshop

So you're making a combination bone and geom slider? Why are you editing RSLT and CASP and using Photoshop for a slider??

What's the problem and exactly what steps did you go through? Can you upload your package? Please be as detailed as possible - no one can help if all you say is "I used this tool and it doesn't work."

what tools do i need to make custom slider?

Depends on what you want the slider to do. There are two types of slider which are made in different ways. Here's a link to two tutorials, one for bone sliders and one for geom sliders. Please see if they tell you what you need to know and post here again if you have specific questions.

i`m trying make a body slider but my sim`s head always ending giant sized

If you're using Delphy's bone slider tool to make a new slider, make sure you're removing the sample head bone transformation.