In version 10.0.40 PU64 new features for developers have been introduced.
First of all, it is possible to add modified objects to the current project automatically. It means no more worries about adding objects to the right project. The modified objects will be added automatically. In order to enable this feature, the "Add files to solution on save" option should be enabled.
The second feature is related to the building process. It is possible to select the label file to be built.