> For the complete documentation index, see [llms.txt](https://docs.justransform.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.justransform.com/development/mapper-and-map-chains/map-chains/updating-a-map-chain.md).
# Updating a Map Chain
To update a Map Chain within Justransform, click "**Open**" within the Map Chain Module and select the saved Map Chain from the Resources folders.
1. Using the Actions buttons within the Development Area, make changes to Map Chain. Use Drag & Drop to add additional link types from the left into the Development Area
**Edit:** Opens the Resource dialogue to replace the current JTMap or JTScript with a different version.
**Delete:** Removes the Map Chain JTMap or JTScript item.
**View:** View a Popup Window of the JTMap or JTScript.
3. Execute the Map Chain using the **Execute** button.
4. Select and Drag the chain links into the correct order. Position 0 is run first.
5. Once completed, click the **Save** icon.
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