# Custom Extensions

**URL:** https://air.tableforums.com/c/airtable-developers/custom-extensions/21.md

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## [About the Custom Extensions category](https://air.tableforums.com/t/about-the-custom-extensions-category/47)

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**Author:** [@ScottWorld](https://air.tableforums.com/u/ScottWorld)\
**Replies:** 0\
**Last updated:** [December 15, 2022, 3:34pm UTC](https://air.tableforums.com/t/about-the-custom-extensions-category/47 "2022-12-15T15:34:59Z")

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Creating your own custom extensions for Airtable.

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## [Sorting line items (records) via drag-and-drop](https://air.tableforums.com/t/sorting-line-items-records-via-drag-and-drop/388)

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**Author:** [@Tom\_Keysers](https://air.tableforums.com/u/Tom_Keysers)\
**Replies:** 10\
**Last updated:** [August 10, 2023, 10:21pm UTC](https://air.tableforums.com/t/sorting-line-items-records-via-drag-and-drop/388 "2023-08-10T22:21:52Z")

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(oh wow, honoured to start the first custom extension topic) I am developing an extension to manage orders based on an ‘Orders’ table and a (linked) ‘Order Line Items’ table. My next objective is to allow line items to …

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## [Can Records or Fields read from Extensions?](https://air.tableforums.com/t/can-records-or-fields-read-from-extensions/557)

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**Author:** [@sleepyjoe](https://air.tableforums.com/u/sleepyjoe)\
**Replies:** 7\
**Last updated:** [May 1, 2023, 4:09pm UTC](https://air.tableforums.com/t/can-records-or-fields-read-from-extensions/557 "2023-05-01T16:09:00Z")

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For instance, can a formula field refer to a formula baked into the extension? Here’s the use case: I’m building an licensing app. If the user has a license key, the formula in the formula field will work. If the user …