Retaining local working files and StarTeam

Hi,

I'm a new user to anthill and I've got a few questions on how to use
it properly.
I've got it setup with CVS and StarTeam (which isn't working, but
that's the other question), and when I go to build, it deletes all the
local files in the working directory and does a clean build.
I'd like only to actually have it do an update rather than a complete
clean checkout when I do my builds, as we're really only changing one
or two directories within the code.  Is there a way to have the Build
Manager refrain from cleaning up the working directory and just do an
update?
Also, my StarTeam doesn't seem to be quite working.  I'm getting an
error message of:
"'stcmd' is not recognized as an internal or external command,
operable program or batch file."

Can someone give me a hand?

Thanks!
Chris