Sync issues link and Sync a custom field User Picker (single user)

Use Case
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Originally asked by Andrey Miranda on 03 November 2020 (original question)

Hi i need to sync the system field Issue LINKS Relate to but i dont doing to sync .
I try with the next link but i dont have result success :

(https://docs.idalko.com/exalate/display/ED/How+to+synchronize+issue+links+on+Jira+Server)

do you know some suggestion tell me

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Answer by Andrey Miranda on 03 November 2020

also i need to sync a custom field type User Picker (single user) on two project .

this is in Jira server .

if you have any suggestion tell me