Not really without a lot of trouble. The only scenario this would work would be if you delete all issues from the project and update the key counter to start from 1 again directly in the database, with a update like the one below:
UPDATE project SET pcounter = 0 WHERE pkey = 'PROJ-KEY';
But if you just want to re-use some of the keys without deleting all the issues in the project, I would say is not possible.
Hey Community mates! Claire here from the Software Product Marketing team. We all know software development changes rapidly, and it's often tough to keep up. But from our research, we've found the h...
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