Adobe Photoshop CC 2014 v.14.xx - Manual (Page 258)

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Image asset names are generated from layer names/layer group names
Image asset generation is enabled for the current document. Once enabled, the feature remains available whenever the document is opened
next. In order to disable image asset generation for the current document, deselect File > Generate > Image Assets.
Generate multiple assets from a layer or layer group
To generate multiple assets from a layer/layer group, separate the asset names with the comma symbol (,). For example, the following layer name
generates three assets:
Ellipse_4.jpg, Ellipse_4b.png, Ellipse_4c.png
A web design use case
Generating image assets from a PSD file is particularly useful for multidevice web design. Consider the following web design and its layer
structure:
A web design and its layer hierarchy
Let's extract the icon on top and the top row of the Global Hotspots image grid as image assets:
Append image format extensions to the appropriate layer names.
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