In SOLIDWORKS, you can specify the color, style, and thickness of lines in named layers. You can move objects into layers, and you can turn layers on and off. The layer list is built into many annotation and dimension dialog boxes.
You can also format lines individually using the Line Format tools. You can specify document-level line thickness and style. Click and set Line Font, Line Style, and Line Thickness.
Layers are used less often in SOLIDWORKS than in 2D CAD systems. SOLIDWORKS has multiple drawing sheets, and you can hide and show drawing views, assembly components, lines, and various other items without using layers.
In addition to creating layers in SOLIDWORKS, you can import 2D CAD drawings with layers into SOLIDWORKS. All 2D CAD layers are preserved in SOLIDWORKS. When exporting from SOLIDWORKS, you can map entity types to specific layers.
The Layer toolbar contains a list of layers in the drawing and the Layer Properties tool 
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Click the Layer Properties tool to bring up the Layers dialog box. Create new layers and specify the Color, Style, and Thickness of lines in each layer.
