How to map two entities in CRM

Hello,

I currently have two entities "Account" and "Quote_custom" .(1:1 Relationship)

Account has account ID and Quote_custom has the same account ID as well.

All I need is to see the relevant Quote_custom record in the account form. Ideally, system should match the account id in both entities and populate relevant Quote_custom record.

How do I achieve this? Any advice is appreciated. Thanks