Displays a list of the drawings you select and lists the available symbols or blocks in each. You can compile a list of symbols and assign them to class definitions.

- Selected Drawings
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Displays the drawing or drawings that contain the symbols you want to add.
- Available Blocks
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Displays a list of blocks contained in the selected drawing.
- Selected Blocks
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Lists the blocks you have selected.
- Add
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Adds one or more blocks to the Selected Blocks list.
- Remove
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Removes one or more blocks from the Selected Blocks list.
- Preview (both)
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Displays the selected block.