I've been able to create only blocks but I need some of them to be slab so it boosts you up when you walk over them like slabs.

and all of the blocks i created i received them back when i destroyed them.

 

Any solutions?

Hi, look at the BlockSlab class. If you don't want a double slab and just want a smaller block, change the block's bounding box to half its size.

Managed to make it work.

Thanks,Now can you tell me how to make it so the block wont drop itself when its not suppose to?

 

for example: i am a berry bush when i destroy it i dont want to receive it,cause people will farm it

By default, blocks drop themselves when mined. Hunt around in the Block class and find the method that drops the item when mines - override it and return your item there.

I found these two command who is most likely fitting to what i am searching.

How can i change them?

 

https://gist.github.com/anonymous/b751823a732c2a383ec5