Replace Block
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Ribbon: Express Tools > Replace Block (in Blocks)
Menu: Express Tools > Blocks > Replace Block
Keyboard: BLOCKREPLACE
Replaces each occurrence of a selected block with a different block that you specify.
DIALOG BOX OPTIONS
Select Original Block Displays a list of all blocks available in the current drawing. Select the block that you want to replace. Or click Pick to select the block directly in the drawing.
Select Replacement Block Displays a list of all blocks available in the current drawing. Select the block that you want to use as a replacment block. Or click Pick to select it directly in the drawing.
Purge unreferenced items when finished? [Yes/No]: To remove the unreferenced block definition from the drawing, choose Yes. To keep the block definition in the drawing, choose No.