adding conditionned fields

[touilmohammed]

i need to add conditions on fields dependent on some other fields on the same block.
To be more specific, if the category of my ticket is X i need some fields to be shown and if it s Y others must be shown ;
Or even as an alternative if a field that i create for exemple has A as a response i need some fields to be shown and if it s B others must be shown ;
If anyone can help;