The purpose of suggested relationships is just to indicate the types of relationships which are typically recommended for each CI class. You can find more details about this in the following link:

https://docs.servicenow.com/bundle/utah-servicenow-platform/page/product/configuration-management/re...

Suggested relationships does not do anything to populate any relationships for CI records. The actual relationship data for CIs have to populated by appropriate methods like discovery, service mapping, manual data import/entry etc.