Is there a way thay I can update the existing description field with add on comments

[Harvinder Singh]

Using csv import feature the earlier descriptions get removed. Is there a way that I can add something on top of the previous description.

[Nic Brough [Adaptavist]]

The CSV import is being seen as an update, and the description is a single field.

To have it pre-pend or append something, you will need to get the current content and merge it with your change in the CSV before uploading it.