How to customize/add logic in Strapi CMS Relation-Ship

#javascript #react #stripe #help

Hello developers.

I need your help in Strapi CMS.
my case is simple.

Here i made on collection type. that is called Center and next one is post.

here Center has many Posts relation.

all centers title

ind_chennai
ind_goa
ksi_mumbai

some post content_title

POST 1
POST 2

When I add/edit a post, I want to show only any center title starting with ind_ in the dropdown.

My problem is if I have to write the logic for this, where do I write it? if you know that way please tell me guys.

Details:

strapi v4
sqlite / psql

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