Not really - Jira doesn't do much in the way of "reversion".
You can delete the new users, but the reason it created them is likely to be because you used them as the reporter or assignee, and Jira won't let you delete them until you've reassigned them and/or changed the reporter.
It's also a bit of a manual process, although you could try some scripting, 95 maybe in the range where it will be less effort (but a lot more boring) to click through them all.
I am facing a lot of problems as CSV import has added values inside the fields.
Like we have a priority field: which is having values like
HIGH > CRITICAL > MEDIUM > LOW
and CSV file is having
1-HIGH > 2-CRITICAL > 3-MEDIUM > 4-LOW
now it has added 1-HIGH > 2-CRITICAL > 3-MEDIUM > 4-LOW fields in the priority along with the earlier fields.
Two things to mention.
for cleanup use bulk edit to change all priorities e.g, from 1-HIGH to HIGH after that delete 1-HIGH from the priorities
For Future imports you need to map the values to existing values. Therefor you need to tick the check box behind the field mapping (I guess it was step 3). In step 4 you then map the values so 1-HIGH becomes HIGH.
You got two options regarding the project.
One is in the second step to define in which project you want to import your data (only one project possible).
The second is you got a column in your csv file which contains the project key (there you can import issues into different projects). You need to map that column to project or project key (don't recall exactly).
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