How can I add value to an exist field, but only for 1 specific project?

[Eden]

Hi,

I want to add value to an exist field, but I want the change will be only for 1 project. 

Thanks in advance

[Nic Brough -Adaptavist-]

Edit the issue you want to put the data into.

Or, if you need to hit many issues, run a search for "project = X" and use bulk-edit to set the field on all the issues in the project.