Hi:
You might want to open a track with Tech Support on this question, as the use of CSS files with a stored process is usually done with an override to the automatic variable &_ODSSTYLESHEET (same concept as &_ODSDEST).
However, not all client applications will receive HTML results and some client applications (such as Web Report Studio) require that the CSS be defined in a special XML file that is available on the Middle Tier configuration files.
In addition, it is not entirely clear where you expect your &_ODSDEST of TAGSETS.NOSTYLE to be used. In fact, there already is a "nostyle" destination -- well, there are 2 -- ODS PHTML and ODS CHTML -- either of those might work for you instead of trying to come up with your own TAGSET template based on TAGSETS.HTML4. It is possible that a simple override of:
[pre]
%let _ODSDEST = CHTML;
[/pre]
might work for you without using a STYLESHEET at all.
I suspect you have some log messages about STYLE not found or TAGSET not found and that means that there is a certain amount of debugging required that will mean that someone has to look at ALL your code and understand your particular method of invoking this stored process.
To send a question to Tech Support, you can go directly to the Tech Support Problem Form here:
http://support.sas.com/ctx/supportform/createForm
cynthia