Explanation
There are two designers you can use to create and edit 1:N (one-to-many) or N:1 (many-to-one) relationships:
* You can create and edit 1:N (one-to-many) or N:1 (many-to-one) entity relationships in Power Apps portal
* You can create and edit create and edit 1:N (one-to-many) or N:1 (many-to-one) entity relationships using solution explorer Reference:
https://docs.microsoft.com/en-us/powerapps/maker/common-data-service/create-edit-1n-relationships