In Lumeer, you set up hierarchical relationships (i.e. hierarchies) between the rows in your tables. The relationships can have multiple levels.
Right-click on a row in the table and choose Indent to move the row to the right. This will make it the child of the row above it. To move the row to the left, choose Outdent.
The same hierarchical relationship, but with a different visual representation (called dependency), is also possible in the Timelines view.
The record from which the arrow starts is superior to the record where the arrow ends.
Hierarchies can be also used in filtering data. You can, for example, create an employee structure and filter by current user. You can then include employees reporting to the current users (in the hierarchy).