Tree of Releases

We use release to reflect our Product Increments. As we are synchronizing with AzureDevops we cannot take advantage of the Release Phases. Therefore It would make sense to be able to define a Hierarchy of Releases: e.g. 

Release PI-5
 --> Release PI - 5 IT 1

 --> Release PI - 5 IT 2

 --> Release PI - 5 IT 3

 --> Release PI - 5 IT 4

 --> Release PI - 5 IT 5

 --> Release PI - 5 IT IP

This would simplify the Product Increment based work.