there are themes that group all the SMS and MMS into there own folder but thats about it. I believe the O2 themes do this if I remember right take a look. you should also update your OS to the new O2 OS in order for this to work properly
PIN:204D7C8C - USE THE SEARCH BUTTON!!!!
Email:firstname.lastname@example.org-Don't email me unless you searched!!
BB 8100 126.96.36.199