If applicants want to build on to an application over time, can they add different activities?

Yes, applications can be drafted over time.  However, an application is populated with the upload of a spatial data shapefile and those data fields that are not spatial derived require the user to data enter information.  If different activities are added to the application while being drafted; new spatial data will be required to be uploaded and new activity identifiers will be given to each activity with each upload.  Users must be aware that the upload of new spatial data will overwrite the previous drafted application.