How to make a custom field display data work across multiple tasks?

Question

Project management

I work according to the following principle:
There is a main task that has its own process, within this process I create subtasks and perform them, respectively, in the main task and in the subtask there can be the same user field, for example, a link to a Wiki page, in which, within the task, on a certain At the stage of the process, it is necessary to make a description (the description itself is regulated and fixed in the corresponding subtask).
In the general field, the same thing - wiki , exists both in the main task and in its subtask.
How can I make it so that when I execute a subtask and fill in the wiki field , its data gets into the main task and is also displayed there?

Answer 1

I didn't quite understand the question. What is this all for? For what? To see the process of working on a large task with the closing of smaller ones? If so, what are the epics not suitable for?