Updated on 12/24/2019
DoubleCAD User Manual Publication
DoubleCAD User Manual : Library Palette
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DoubleCAD User Manual : Library Palette

Symbols and parametric parts are groups of objects available for repeated use. While groups and blocks are internal to a drawing, symbols and parts are external files. The Symbols palette is used to display and insert symbols found in the various symbol libraries - both those included with DoubleCAD installation and those you create yourself. You can also use the palette to save symbols.
See Library.