I want to create a customfiled with the same functionality as the Epic Link.

[Luvo Hubela]

I would like to create a customfield that can have the same functionality as the Epic Link customfield.

I want this customfield to be able to link issues the very same way as the Epic Link.

[Nic Brough -Adaptavist- · Accepted solution]

There is no way to do this without code.   The Epic Link has a block of dedicated system functions built behind it.

You would need to write a new custom field type to support this, including replicating all the functions in Jira Software that are not part of the field but pull it in.