# About Modifying Block Definitions [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) → [Concepts](Help%20System/GSTARCAD/2027/Commands/02%20Concepts/(Concepts).md) **Modify a Block Definition** You can edit a block definition or a block reference already inserted in the drawing. If you redefine block definitions in your current drawing, all the block references will be affected <a id="w_31"></a>simultaneously. You have two options to redefine a block definition: - Modify the block definition in the current drawing. - Modify the block definition in the source drawing and reinsert it into the current drawing. **Modify a Block Definition in the Current Drawing** You can use the Block Editor (BEDIT command) to modify a block definition. If you want to edit a block without attribute, just double-click the block to open the Block Editor.  **Update a Block Definition That Originated from a Drawing File** When you modify the original drawing file , block definitions which you have created by inserting a drawing file will not be updated automatically. You can use INSERT command to update a block definition from the drawing file. **Redefine Block Attributes** You can edit the value of attributes of a block reference, you can also use grips to change the location of attributes in a block. If attributes are multiple-line text, you can resize the width of the text by moving grips. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences/About%20Modifying%20Block%20Definitions.html) · © Gstarsoft Co., Ltd.