Selected to Active

Selected to active is a bake mode in Blender that projects and bakes texture data from a set of source object(s) to a single target object.

Render Baking - Blender 4.2 Manual

The selected to active panel contains all the necessary properties for baking textures from source to a target object. By default, this option and the panel's properties are disabled. You can enable it by clicking the checkbox next to the panel's name.

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Source Location

When enabled, all the source objects will be snapped to the target object's location. After the textures are baked, the source objects' locations will be restored.

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Final Object

If the active object as final option is enabled, the target object will be used as the final object instead of creating a new one.

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Target Mode

With the target object, you can choose how to handle the object selection and the source to target bake process.

Changing the method will update the sub-panel below it, which contains the selected to active bake settings. The settings in the sub-panel will change based on the selected target method option.