# Convert BLOCK to XREF Command [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [Commands](Help%20System/GSTARCAD/2021/Commands/(Commands).md) → [B](Help%20System/GSTARCAD/2021/Commands/B/(B).md) ### Convert BLOCK to XREF Replace all instances of a standard block with an xref. Unbind xrefs that are bound. **Menu:** Express\>Blocks\>Convert Block to Xref **Command Entry:** BLOCKTOXREF  BLOCKTOXREF searches the entire drawing for references to a specified block name and replaces them with an xref that you specify. You can have the unreferenced block purged when done. In BLOCKTOXREF dialog box. Select a block to replace: Table and 4 chairs. Then select: OK  In Select a Xref file. Select the Xref you want. Then select: open   Purge unreferenced items when finished? Yes/No --- Gstarsoft Co.,Ltd