I'm trying to create a relationship between 2 apps

When I did it through the employee app, it only allowed me to say it's one out of office to many employees, when I needed it the other way around. Which I think in turn, made the employee table rely on the out of office table in their respective apps. When I do it from the out of office app, the relationship is correct, one employee have many out of office, but it only allows for summary fields to be created for the employee app.