This option is available in the AutoCAD or DGN Conversion Settings dialog box and allows you to map AutoCAD blocks and MicroStation cells to symbols when importing and exporting.
Export to AutoCAD
If Create Blocks from Symbols is selected, blocks are created in the AutoCAD file. Select from the Symbol Lookup Table list the option to use an existing symbol lookup table, create a symbol lookup table, or use no symbol lookup table. If this option is not selected, symbols are exported as exploded objects.
Import from AutoCAD
If Match Blocks to Symbols is checked, blocks are matched to related symbols. Select from the Symbol Lookup Table list the option to use an existing symbol lookup table, create a symbol lookup table, or use no symbol lookup table. Any symbol names that are not found are ignored. If this option is not selected, the blocks are exploded when imported.
Export to DGN
Symbols are created as cells. Select from the Symbol Lookup Table list the option to use an existing symbol lookup table, create a symbol lookup table, or use no symbol lookup table.
If Use Cell Library is checked and a cell library is selected. Cells are extracted from the cell library. If the cell name is not found it is ignored.
Import from DGN
If Match Cells to Symbols is checked, cells are matched to related symbols. Select from the Symbol Lookup Table list the option to use an existing symbol lookup table, create a symbol lookup table, or use no symbol lookup table. If the related symbol names are not found they are ignored. If this option is not selected, cells are exploded when imported.