Well I saw an application Regarding this and dunno if its working or not
but if u really want to make a subfolder ..then go ahead and surely u will do without a need of any applications....here is the way to do everything...

CHANGE THE NAME OF THE APPLICATIONS EVEN DEFAULT in any symbian phones

i have tested this one in 6630 and 6681 and dunno abt other phones if its working or not

but i dont think its risky in trying it one out..
go further and read this carefully ...


FIRST OF ALL U HAVE TO TAKE THE APP. TO THE FIRST PLACE OF THE MENU



now you need to send an .sis file to your phone, (it really does not matter which app or game) as you can just unistall after

now you install the .sis as you normally would, then as soon as its complete, press menu (need to be fast here) and highlight a folder icon (liKE MYOWN,TOOLS,MEDIA) and press options. now just wait.

after a few seconds, you will see your cursor go back to highlight the folder at the start, (the one which you moved there just now) and now because you still have the options menu open, you will see that you still have the option to move to folder , normally not an option on any symbian phones. when your cursor has highlighted over folder, thats it, just simply select move to folder and then move the folder to another folder..


this also works if you uninstall a app / game and quickly move to menu as soon as its finished uninstalling, as this also refreshes the menu, causing the cursor to jump to the first icon, be it a folder or application icon.

note
this works on 6630 and 6681 as this is tested on6630 and 6681, and NAME stays where you put it even after restarting phone, Yeah i dont know if this will work on other symbian phones Hm!? but see no reason why it shouldnt,.this is great way to organise your applications games even CHANGE NAME

im very curios on which other phones this works on Hmmm... it works a treat on 6630 and 6681, no problems as yet, everything is still very stable..

ITS MORE LIKE CREATING SUBFOLDERS

Enjoy and please reply if you like it n if you have any problem just rite in my guest book i will solve that:-)