How to set 'Offset' for each sprites through Texture Packer tool?

Hi guys,

I am new to Cocos2d-X. I learned about sprites & animation in cocos2dX by using TexturePacker and its quit easy BUT i am not able set offset for each sprites.
May i know how to set offset?

Manually i tried in .plist file offset parameter and its working fine but there is not such GUI for that so i can easily set such parameters. or am i missing something?

offset
{0,0}

Also can i create animation in TP? or any other tool? [OS: windows based]

thanks,
-Smit

Anyways i figure it out, what was the problem?
There is no need to add offset manually. Artist need to create pngs such a way that tool will add offset to sprites after trim/crop option selected.