How to exclude stages from a release in Azure DevOps?

I have a CD pipeline in Azure DevOps. There are total 4 stages in my pipeline, stage1-qa1, stage2-qa2, stage3-qa3 and finally stage3-production deployment. stage3-qa3 not applicable for some app features in a particular release

My requirement is, sometimes, for a particular release I have to exclude qa3 stage and include/run only qa1 and qa2 and production deployment stages.

How to achieve this in Azure DevOps ?

Note: I tried option Azure DevOps -> Organization settings -> Pipelines -> Settings -> “Disable stage chooser”, issue is, it is useful with only YML based multi stage pipelines, not with classic editor based pipelines.

Solution

Set the stage to Manual Only trigger in the Pre-deployment conditions of the qa3 stage.