Part field applications can be created by editing the specific area measurement in batch processing.
You can alter the "Area Applied" directly when editing an application record
Field Track maintains an application's "Cost/Area" by storing the full field's area, so a part field costs will always calculate the "Cost/Area" on the field's whole area to maintain correct main screen costing displays. You can edit the application's internal record of this if it gets out of synch with the field by clicking on the "Area Applied" label when editing an application.