Why? Publishing engine always use the default style sheet to publish

Hi Experts

I have just started to work with Arbortext software and am having some trouble.　

In attempt to set up the dynamic publishing system,　I have Completed Installing Arbortext Editor, PE, and ACM.　

Also,have sucessfuly connected Arbortext Editor to PE.

Now, I am using Publishing engine with arbortext editor to publish document.

My problem is I am not able to use custom stylesheet while publishing.

How to use custom .style stylesheet for publishing?

Publishing engine always use the default style sheet to publish.

As a work around I am replacing default stylesheet with custom.

I read the discussion bellow with the same issue, but I couldn't understand the solutions discussed.

Using custom stylesheet while publishing using publishing engine

Please help me to understand.

Thanks in Advance.