data conversion , ebay & osc

have 5 web sites that is suopplied by a rss feed i think? i have easy populate advance installed which will take the stock items and convert it to a cvs file, another gaf made a conversion tool to transfer this to a ebay turbo lister file. however i want a more basic program it works but it can edit a well which i want removed, it also dont handle ebay catergorys well. so want a program that will convert ione way and also convert turbo lister files back to oscommerce data, basically so i can quickly transfer my stock items from one web site to another or to ebay . including the pictures and layout [login to view URL] is one of them i am a novice sio prehaps i have the facilities to do this anyway as the web sites seem to have xml , rss and epop feeds or facilities. could do with this quickly as been asking for long time on this and begining to understand what can be done and what is involved so i think i aimed it at the right people this time on the project details as it looks to me it needs someone in xml or php which is all double dutch to me , however the gaf program made for me before is not bad but it has things in it i dont want and missed out others i do. i hoped he would fine tune it but i dont seem to be able to get back to him, so the new program will be customise to my web sites and copywrite to them only. the gaf program is to big to list here,