Hello here i will help you setup your SCTD to show your partys damage!

First you need to download these two addons:
SCT: http://wow.curse.com/downloads/details/111/
Shows damage taken, buffs/debuffs etc. very helpfull and good addon to use.
SCTD: http://wow.curse.com/downloads/details/2992/
Shows your damage done in a more in a more controlled way.

Now after you have downloaded these two addons and put them in your interface/addons folder, open your SCTD folder and
find the file sctd.lua, open it and find the line:
local COMBATLOG_OBJECT_NONE = COMBATLOG_OBJECT_NONE
Under this line u copy and paste this line


Code:
local COMBATLOG_FILTER_MINE = bit.bor (
					COMBATLOG_OBJECT_AFFILIATION_PARTY,
					COMBATLOG_OBJECT_AFFILIATION_MINE,
					COMBATLOG_OBJECT_REACTION_FRIENDLY,
					COMBATLOG_OBJECT_CONTROL_PLAYER,
					COMBATLOG_OBJECT_TYPE_PLAYER,
					COMBATLOG_OBJECT_TYPE_OBJECT
				);
Have fun!