I would like to have my past applications copied and reuse

[M_Tomy]

Dear Experts

I would like to know how to implement copying and reusing applications submitted in the past.
Please let me know if you have any articles that would be helpful.
Any article that may be helpful for any one of the following points to keep in mind is acceptable.

▼ Background
We accept applications from users on our portal.
After more than a year of operation, we received a request from a user to copy past applications to save labor input at the time of application.
Some of the users in charge have applications that they submit on a daily basis, and it is difficult for them to manually input all of them.

▼ Points to note
1.
We would like to separate the process for copying and not copying.
Because I think that manual input will be required if the relevant application is the first time.

2.
The only applications that can be copied are your past applications.
I would like to be able to cite other people's applications in the same organization, except for applications that are related to security.　
However, as a small start, we will only cite your own past applications.

3.
I am also wondering how we should take into account any changes to the variables in the catalog item (increase/decrease, change of type).

Best regards.

[M_Tomy]

From the questioner.

Regarding the text of the question, there were some mistranslations due to the translation tool that was used to translate the question, so I would like to correct them.
All "applications" in note 2 should be "requests".