devilz, I don't understand what you are trying to do with Scribus.
Scribus is for creating "static" PDF files. I can't see what you would want it for if you were trying to create a catalogue for e-commerce. Wouldn't your website be your catalogue?
My, admittedly fairly basic, experience of e-commerce is that things move too quickly to produce catalogues that are of any use to anyone. Items are added and removed - and prices changed - so often that you'd have to spend more time updating the catalogue than actually doing business.
If you really do need to produce a PDF catalogue to go along with an e-commerce site I'd personally suggest not using Scribus. It simply doesn't have the tools to be able to publish things like that without someone putting in a whole lot of manual work. (You could use scripts to help to create your documents but you are looking at very business-specific and complex scripts that would need a lot of work to get right.)
I might have totally mis-understood you though.
Please explain more about what you are trying to do if I have mistaken your intentions.