Hm, if you search in youtube piximperfect + something you want, you can find most of the common stuff in PS. Though since you already have the picture without the sofa, it can be done in a few seconds.
The way Volta said, like
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at min 4, when you select that white square, black hides, & around the edges you paint with black to refine it. Otherwise, you can upload the pictures here, if I'm missing something.
If you only wanted the shadow to put it in a
different picture, that can be done too, but a few more tricks behind that.