Make it possible to display only the value that was selected in the filter

Maybe I described it a little confusingly, I can shoot a video if necessary, but I'll try to convey it more precisely in text:
We have two directories: "Topic of the request" and "Subtopic of the request", which are displayed in the process as a multi-list through an additional field. Managers can select multiple topics and subtopics when communicating with clients.
However, the following situation occurs in the reports:
If you filter by the additional field "Topic" and, for example, select "Topic 1", the "Subtopics" list continues to display subtopics from other topics.
In information output blocks, such as "Process Count Graph with Additional Field Value" or "Process Count Chart with Additional Field Value", data from subtopics that do not belong to the selected topic but were selected in the process along with the selected topic is also displayed.
Is it possible to configure the system so that only those subtopics that correspond to the selected topic are displayed in filters, reports, and graphs?
Thanks for your help!

Thank you, ok. Please tell me, how can I make it so that when I select a topic, only the subtopics of this topic are displayed in the process? Previously, I linked directories. And after selecting a topic, only the subtopics of this topic were displayed. Now, when I do everything in one directory, after displaying additional fields in the process, everything is displayed in a row, regardless of which topic I select, I see subtopics of other topics, including

You need to link both of your additional fields to this directory and then it should filter records by topic if it is selected in the process

Yes, I understand. I have another problem now. When I add a directory to the process through additional fields, when selecting a Topic in the Subtopics field, all subtopics are displayed at once, without grouping by Topics. It is necessary that after selecting a Topic in the corresponding field, only its Subtopics are pulled up. Previously, I did this using the method of 2 directories, 1 directory - topics, 2 directory - subtopics, in the second directory the topic field was tied to directory 1, and it worked.
Maybe you can make a sample, I will pay for the time spent, but so that it is displayed normally in the process and then in the analytics. Thank you
Topic1
Subtopic 1 (1)
Subtopic 2 (1)
Subtopic 3 (1)
Topic 2
Subtopic 1 (2)
Subtopic 2 (2)
Subtopic 3 (2)

https://1b.app/ua/partner/onebox-corp/ contact the integrators, they will be able to quickly set up the required functionality

Ok. Thank you.