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I can't find info in the manual or google. I want to learn about this option and what it does to shape keys? How can I use it?

https://docs.blender.org/manual/uk/dev/modeling/meshes/editing/vertex/blend_shape.html

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One very common use is to repair a shape key from a mistake, while leaving the desired deformations intact: if you like your shape key but you see some moving vertices that should stay still, you can select them, choose blend from shape, pointing at the basis shape, unchecking the "add" option (so to replace the moving vertices informations with the basis static locations).

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  • $\begingroup$ What about the value of the shape key that needs to be kinda like "edited"? Should I set it to 0 while doing the steps you mentioned? $\endgroup$ – user2824371 Oct 24 at 11:34
  • $\begingroup$ No, it should be set to 1, for total influence (go exactly in the basis locations). A value less than 1 will attenuate the effect of the shape key on those vertices. A value of 0 just does nothing. $\endgroup$ – josh sanfelici Oct 24 at 17:14
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It looks like it's a way to copy the location of the selected vertices from another shapekey.

For example let say that it's your basis shapekey:

enter image description here

And this is your shapekey #1, called Key 1 by default:

enter image description here

If you want one vertex to go back to the location it has in the basis shapekey, select this vertex, press CtrlV > Blend from Shape:

enter image description here

then in the Operator box select the shapekey from which you want to copy the vertex location, tweak the Blend value:

enter image description here

Now your Key 1 will look like that, the vertex gets the position it has in the basis shapekey:

enter image description here

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