[Scribus] Trapping and Overprint

[jon]

Hi to all,

I am a bit confused, so this might be a questions already answered.
But ...  is there a way to predifine overprinting and/or trapping in 
scribus?
Or, being more precize, a way to predifine overprinting/trapping in a 
manner witch PS-RIPS commonly recognize?

thanks for help
Jon