Hi, I've been messing around in radiant and when I convert images I always mix where they are . So I found this (it's my tut I found it) to create your own category for textures , ok let's start :

Step 1 : go to your root folder and go the folder called (deffiles) and locate a file named (material.gdf) right click on it and hit "Edit with notepad++" .




Step 2 : don't do anything yet ! when you open the file hit (ctrl + g) to go to the line 89 you will find this ("sign",) hit enter after that and copy the sign thingy to the new line , after that replace the "sign" with what name your category is going to be for me I made it "tim" save and close the file .




Step 3 : In the same folder go to the (materials) folder inside it & scroll down to the bottom to find a file called (usage.txt) right click and edit with notepad++ again :



Step 4 : when you open it go to the line 40 you will find (sign) hit enter after that and type your category name don't MISSPELL it !! save and close the file .



And you're done , congrats lol now when you got to ASSMAN Or RADIANT you will find your new category like this :