[SOLVED] using css from other themes in Atahualpa

Hi - Im obviously not very experienced in WP CSS etc but
I suspect it must be possible to use some of the css from another theme I like
and import it into Atahualpa no?
For instance... I find a menu style I like in some free theme...
it has nice rounded tabs ad great borders and shadows etc...

Is there anywhere I can find tips as to which css to enter where for this
and for othe styling?
It seems to me that for a beginner it should be at least slightly easier than starting from scratch no?

Also - If I purchace Themeframe and generate a beautiful design
I would want to use this sort of approach to bring the design into Atahualpa... no?

Please explain if I am misunderstanding the basics here.

Dan V