I already posted this as a comment to another suggestion but just to be sure it gets noticed :-)

It would be really great if the field Related Organisations is made available in other parts of Pipedrive. Currently you only have access to this information on the Organisation Detail Page and not having it on the Organsiation List Page (and its filters) or within Workflow Automation is a missed opportunity. Parent and Daughter companies are pretty common but not being able to administrate this properly in Pipedrive means a serious limitation to your audience and even then, even small business owners are more and more likely to deal with parent/daughter organisations and other holding constructions.