Debugging Pentaho: select some steps to execute in a transformation

Hi,

I have a very simple question....(newbie)

I have a transformation with 8 steps, and I am havinf an error. I would like to execute only the 4 first setps...is it possible??

I disconnect (hop) the 4 step from 5, but when I execute pentaho run all the steps (the 8 steps).

Which is the optimal eay to do this??, i know in some tools you have the option of select some steps and execute only this steps..
Perhaps is a simple option, but I don't find it and the debugger don't seem to work on that way..

Any advice will be greatly apreciated.

thanks in advance