How can I upload custom pack using XS++

Hello, bit of a stupid question really.....
I know how to upload the flash files however I am unsure how to upload the customer pack onto a W660i using XS++

Does anyone know how I do this using XS++ alos do I have to do it at the same time I upload the firmware?

MAny thanks!:)

Download Custpack.
Make a folder named own_custpack in directory where you put XS++.
Extract the Custpack in that folder including folder tpa.
In XS++, when you do the customization you select own_custpack.