add multiple prefix of different category in the new thread

[deal4512]

Thanks zinga burga. You are really helpful.

Please Help i want to create a drop down filter and search like this page using the custom thread field.
http://www.leefish.nl/mybb/forumdisplay....http://www.leefish.nl/mybb/forumdisplay.php?filtertf_prefix=Sims2&filtertf_pfcat=Buy&fid=7&filtertf_dld_ep_prefix=OFB&sortby=lastpost&order=desc

As far as i believe, there is something that needs to be done with  forumdisplay_searchforum_inline, but i dont know how to do it.
I know very little coding. I even dont know to create a simple filter through category url like in wordpress.Kindly help me in this regard.

Thanks a lot in advance.