copy paste without background

Hi everyone,

A small doubt.

Say, I want to draw an image (new image ofcourse, say, image A) in paintshop. Now part of the image, I need to copy from another existing image(say, image B) located in my hard disk. When I tried to copy the selected portion from image B (using rectangle mask tool option), a rectangular portion gets selected, which contains the desired porion of the image B, as well a surrounding white background also. Now when I paste this on image A, the same rectangular portion, along with that white background gets pasted, which I don't want.

Is there any way, to copy-paste the desired portion of image B, without selecting the white background ?

Thankas again,

Bab